Panda3D
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GeomVertexFormat Class Reference

This class defines the physical layout of the vertex data stored within a Geom. The layout consists of a list of named columns, each of which has a numeric type and a size. More...

Inheritance diagram for GeomVertexFormat:
TypedWritableReferenceCount GeomEnums TypedWritable ReferenceCount TypedObject MemoryBase MemoryBase

Public Member Functions

 __init__ ()
 
 __init__ (const GeomVertexArrayFormat array_format)
 
 __init__ (const GeomVertexFormat copy)
 
int addArray (const GeomVertexArrayFormat array_format)
 Adds the indicated array definition to the list of arrays included within this vertex format definition. The return value is the index number of the new array. More...
 
 alignColumnsForAnimation ()
 Reprocesses the columns in the format to align the C_point and C_vector columns to 16-byte boundaries to allow for the more efficient SSE2 operations (assuming SSE2 is enabled in the build). More...
 
 clearArrays ()
 Removes all of the array definitions from the format and starts over. More...
 
const GeomVertexAnimationSpec getAnimation ()
 Returns the GeomVertexAnimationSpec that indicates how this format's vertices are set up for animation. More...
 
const GeomVertexArrayFormat getArray (int array)
 Returns the description of the nth array used by the format. More...
 
list getArrays ()
 
int getArrayWith (const InternalName name)
 Returns the index number of the array with the indicated column, or -1 if no arrays contained that name. More...
 
int getArrayWith (int i)
 Returns the index number of the array with the ith column. More...
 
const GeomVertexColumn getColumn (const InternalName name)
 Returns the specification with the indicated name, or NULL if the name is not used. Use get_array_with() to determine which array this column is associated with. More...
 
const GeomVertexColumn getColumn (int i)
 Returns the ith column of the specification, across all arrays. More...
 
list getColumns ()
 
const InternalName getMorphBase (int n)
 Returns the name of the base column that the nth morph modifies. This column will also be defined within the format, and can be retrieved via get_array_with() and/or get_column(). More...
 
list getMorphBases ()
 
const InternalName getMorphDelta (int n)
 Returns the name of the column that defines the nth morph. This contains the delta offsets that are to be applied to the column defined by get_morph_base(). This column will be defined within the format, and can be retrieved via get_array_with() and/or get_column(). More...
 
list getMorphDeltas ()
 
const InternalName getMorphSlider (int n)
 Returns the slider name associated with the nth morph column. This is the name of the slider that will control the morph, and should be defined within the SliderTable associated with the GeomVertexData. More...
 
list getMorphSliders ()
 
int getNumArrays ()
 Returns the number of individual arrays required by the format. If the array data is completely interleaved, this will be 1; if it is completely parallel, this will be the same as the number of data types. More...
 
int getNumColumns ()
 Returns the total number of different columns in the specification, across all arrays. More...
 
int getNumMorphs ()
 Returns the number of columns within the format that represent morph deltas. More...
 
int getNumPoints ()
 Returns the number of columns within the format that represent points in space. More...
 
int getNumTexcoords ()
 Returns the number of columns within the format that represent texture coordinates. More...
 
int getNumVectors ()
 Returns the number of columns within the format that represent directional vectors. More...
 
const InternalName getPoint (int n)
 Returns the name of the nth point column. This represents a point in space, which should be transformed by any spatial transform matrix. More...
 
list getPoints ()
 
const GeomVertexFormat getPostAnimatedFormat ()
 Returns a suitable vertex format for sending the animated vertices to the graphics backend. This is the same format as the source format, with the CPU-animation data elements removed. More...
 
const InternalName getTexcoord (int n)
 Returns the name of the nth texcoord column. This represents a texture coordinate. More...
 
list getTexcoords ()
 
const GeomVertexFormat getUnionFormat (const GeomVertexFormat other)
 Returns a new GeomVertexFormat that includes all of the columns defined in either this GeomVertexFormat or the other one. If any column is defined in both formats with different sizes (for instance, texcoord2 vs. texcoord3), the new format will include the larger of the two definitions. More...
 
const InternalName getVector (int n)
 Returns the name of the nth vector column. This represents a directional vector, which should be transformed by any spatial transform matrix as a vector. More...
 
list getVectors ()
 
bool hasColumn (const InternalName name)
 Returns true if the format has the named column, false otherwise. More...
 
 insertArray (int array, const GeomVertexArrayFormat array_format)
 Adds the indicated array definition to the list of arrays at the indicated position. This works just like add_array(), except that you can specify which array index the new array should have. More...
 
bool isRegistered ()
 Returns true if this format has been registered, false if it has not. It may not be used for a Geom until it has been registered, but once registered, it may no longer be modified. More...
 
 maybeAlignColumnsForAnimation ()
 Calls align_columns_for_animation() if this format's AnimationSpec indicates that it contains animated vertices, and if vertex-animation-align-16 is true. More...
 
GeomVertexArrayFormat modifyArray (int array)
 Returns a modifiable pointer to the indicated array. This means duplicating it if it is shared or registered. More...
 
GeomVertexFormat operator= (const GeomVertexFormat copy)
 
 output (Ostream out)
 
 packColumns ()
 Removes wasted space between columns. More...
 
 removeArray (int array)
 Removes the nth array from the format. More...
 
 removeColumn (const InternalName name, bool keep_empty_array)
 Removes the named column from the format, from whichever array it exists in. If there are other columns remaining in the array, the array is left with a gap where the column used to be; if this was the only column in the array, the array is removed (unless keep_empty_array is true). More...
 
 removeEmptyArrays ()
 Removes the arrays that define no columns. More...
 
 setAnimation (const GeomVertexAnimationSpec animation)
 Resets the GeomVertexAnimationSpec that indicates how this format's vertices are set up for animation. You should also, of course, change the columns in the tables accordingly. More...
 
 setArray (int array, const GeomVertexArrayFormat format)
 Replaces the definition of the indicated array. More...
 
bool unref ()
 This method overrides ReferenceCount::unref() to unregister the object when its reference count goes to zero. More...
 
 write (Ostream out, int indent_level)
 
 writeWithData (Ostream out, int indent_level, const GeomVertexData data)
 
- Public Member Functions inherited from TypedWritable
object __reduce__ ()
 
object __reduce_persist__ (object pickler)
 
str encodeToBamStream ()
 Converts the TypedWritable object into a single stream of data using a BamWriter, and returns that data as a string string. Returns empty string on failure. More...
 
bool encodeToBamStream (String data, BamWriter writer)
 Converts the TypedWritable object into a single stream of data using a BamWriter, and stores that data in the indicated string. Returns true on success, false on failure. More...
 
UpdateSeq getBamModified ()
 Returns the current bam_modified counter. This counter is normally incremented automatically whenever the object is modified. More...
 
 markBamModified ()
 Increments the bam_modified counter, so that this object will be invalidated and retransmitted on any open bam streams. This should normally not need to be called by user code; it should be called internally when the object has been changed in a way that legitimately requires its retransmission to any connected clients. More...
 
- Public Member Functions inherited from TypedObject
TypeHandle getType ()
 Derived classes should override this function to return get_class_type(). More...
 
int getTypeIndex ()
 Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. This is equivalent to get_type().get_index(). More...
 
bool isExactType (TypeHandle handle)
 Returns true if the current object is the indicated type exactly. More...
 
bool isOfType (TypeHandle handle)
 Returns true if the current object is or derives from the indicated type. More...
 
- Public Member Functions inherited from ReferenceCount
int getRefCount ()
 Returns the current reference count. More...
 
 ref ()
 Explicitly increments the reference count. User code should avoid using ref() and unref() directly, which can result in missed reference counts. Instead, let a PointerTo object manage the reference counting automatically. More...
 
bool testRefCountIntegrity ()
 Does some easy checks to make sure that the reference count isn't completely bogus. Returns true if ok, false otherwise. More...
 
bool testRefCountNonzero ()
 Does some easy checks to make sure that the reference count isn't zero, or completely bogus. Returns true if ok, false otherwise. More...
 
bool unref ()
 Explicitly decrements the reference count. Note that the object will not be implicitly deleted by unref() simply because the reference count drops to zero. (Having a member function delete itself is problematic.) However, see the helper function unref_delete(). More...
 

Static Public Member Functions

static TypeHandle getClassType ()
 
static const GeomVertexFormat getV3 ()
 Returns a standard vertex format with just a 3-component vertex position. More...
 
static const GeomVertexFormat getV3c4 ()
 Returns a standard vertex format with a 4-component color and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3c4t2 ()
 Returns a standard vertex format with a 2-component texture coordinate pair, a 4-component color, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3cp ()
 Returns a standard vertex format with a packed color and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3cpt2 ()
 Returns a standard vertex format with a 2-component texture coordinate pair, a packed color, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3n3 ()
 Returns a standard vertex format with a 3-component normal and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3n3c4 ()
 Returns a standard vertex format with a 4-component color, a 3-component normal, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3n3c4t2 ()
 Returns a standard vertex format with a 2-component texture coordinate pair, a 4-component color, a 3-component normal, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3n3cp ()
 Returns a standard vertex format with a packed color, a 3-component normal, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3n3cpt2 ()
 Returns a standard vertex format with a 2-component texture coordinate pair, a packed color, a 3-component normal, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3n3t2 ()
 Returns a standard vertex format with a 2-component texture coordinate pair, a 3-component normal, and a 3-component vertex position. More...
 
static const GeomVertexFormat getV3t2 ()
 Returns a standard vertex format with a 2-component texture coordinate pair and a 3-component vertex position. More...
 
static const GeomVertexFormat registerFormat (const GeomVertexArrayFormat format)
 This flavor of register_format() implicitly creates a one-array vertex format from the array definition. More...
 
static const GeomVertexFormat registerFormat (const GeomVertexFormat format)
 Adds the indicated format to the registry, if there is not an equivalent format already there; in either case, returns the pointer to the equivalent format now in the registry. More...
 
- Static Public Member Functions inherited from TypedWritableReferenceCount
static TypedWritableReferenceCount decodeFromBamStream (str data, BamReader reader)
 Reads the string created by a previous call to encode_to_bam_stream(), and extracts and returns the single object on that string. Returns NULL on error. More...
 
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from TypedWritable
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from TypedObject
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from ReferenceCount
static TypeHandle getClassType ()
 

Additional Inherited Members

- Public Types inherited from GeomEnums
enum  AnimationType { AT_none = 0, AT_panda = 1, AT_hardware = 2 }
 The type of animation data that is represented by a particular GeomVertexFormat. More...
 
enum  Contents {
  C_other = 0, C_point = 1, C_clip_point = 2, C_vector = 3,
  C_texcoord = 4, C_color = 5, C_index = 6, C_morph_delta = 7,
  C_matrix = 8, C_normal = 9
}
 The contents determine the semantic meaning of a numeric value within the vertex data. This is also used to determine what automatic transforms might be applied to the various columns. More...
 
enum  GeomRendering {
  GR_indexed_point = 1, GR_indexed_other = 65536, GR_indexed_bits = 65537, GR_point = 2,
  GR_point_uniform_size = 4, GR_per_point_size = 8, GR_point_perspective = 16, GR_point_aspect_ratio = 32,
  GR_point_scale = 64, GR_point_rotate = 128, GR_point_sprite = 256, GR_point_sprite_tex_matrix = 512,
  GR_point_bits = 1022, GR_triangle_strip = 1024, GR_triangle_fan = 2048, GR_line_strip = 4096,
  GR_composite_bits = 7168, GR_strip_cut_index = 131072, GR_flat_first_vertex = 8192, GR_flat_last_vertex = 16384,
  GR_shade_model_bits = 24576
}
 This type specifies a number of bits that are used to represent the rendering requirements of a particular Geom, as well as the rendering capabilities of the GSG. The difference between the two indicates whether the Geom needs to be munged for the GSG. More...
 
enum  NumericType {
  NT_uint8 = 0, NT_uint16 = 1, NT_uint32 = 2, NT_packed_dcba = 3,
  NT_packed_dabc = 4, NT_float32 = 5, NT_float64 = 6, NT_stdfloat = 7
}
 The numeric type determines what physical representation is used to encode a numeric value within the vertex data. More...
 
enum  PrimitiveType {
  PT_none = 0, PT_polygons = 1, PT_lines = 2, PT_points = 3,
  PT_patches = 4
}
 The primitive type represents the core primitive type of a particular GeomPrimitive. It's used for determining what kind of antialiasing should be enabled. More...
 
enum  ShadeModel { SM_uniform = 0, SM_smooth = 1, SM_flat_first_vertex = 2, SM_flat_last_vertex = 3 }
 The shade model specifies whether the per-vertex colors and normals indexed by a given primitive truly represent per-vertex colors and normals, or whether they actually represent per-triangle flat-shaded colors and normals. More...
 
enum  UsageHint {
  UH_client = 0, UH_stream = 1, UH_dynamic = 2, UH_static = 3,
  UH_unspecified = 4
}
 

Detailed Description

This class defines the physical layout of the vertex data stored within a Geom. The layout consists of a list of named columns, each of which has a numeric type and a size.

The columns are typically interleaved within a single array, but they may also be distributed among multiple different arrays; at the extreme, each column may be alone within its own array (which amounts to a parallel-array definition).

Thus, a GeomVertexFormat is really a list of GeomVertexArrayFormats, each of which contains a list of columns. However, a particular column name should not appear more than once in the format, even between different arrays.

There are a handful of standard pre-defined GeomVertexFormat objects, or you may define your own as needed. You may record any combination of standard and/or user-defined columns in your custom GeomVertexFormat constructions.

Member Function Documentation

◆ __init__() [1/3]

__init__ ( )

◆ __init__() [2/3]

__init__ ( const GeomVertexArrayFormat  array_format)

◆ __init__() [3/3]

__init__ ( const GeomVertexFormat  copy)

◆ addArray()

int addArray ( const GeomVertexArrayFormat  array_format)

Adds the indicated array definition to the list of arrays included within this vertex format definition. The return value is the index number of the new array.

This may not be called once the format has been registered.

◆ alignColumnsForAnimation()

alignColumnsForAnimation ( )

Reprocesses the columns in the format to align the C_point and C_vector columns to 16-byte boundaries to allow for the more efficient SSE2 operations (assuming SSE2 is enabled in the build).

Also see maybe_align_columns_for_animation().

◆ clearArrays()

clearArrays ( )

Removes all of the array definitions from the format and starts over.

This may not be called once the format has been registered.

◆ getAnimation()

const GeomVertexAnimationSpec getAnimation ( )

Returns the GeomVertexAnimationSpec that indicates how this format's vertices are set up for animation.

◆ getArray()

const GeomVertexArrayFormat getArray ( int  array)

Returns the description of the nth array used by the format.

◆ getArrays()

list getArrays ( )

◆ getArrayWith() [1/2]

int getArrayWith ( const InternalName  name)

Returns the index number of the array with the indicated column, or -1 if no arrays contained that name.

The return value can be passed to get_array_format() to get the format of the array. It may also be passed to GeomVertexData::get_array_data() or get_data() or set_data() to manipulate the actual array data.

This may only be called after the format has been registered.

◆ getArrayWith() [2/2]

int getArrayWith ( int  i)

Returns the index number of the array with the ith column.

The return value can be passed to get_array_format() to get the format of the array. It may also be passed to GeomVertexData::get_array_data() or get_data() or set_data() to manipulate the actual array data.

◆ getClassType()

static TypeHandle getClassType ( )
static

◆ getColumn() [1/2]

const GeomVertexColumn getColumn ( const InternalName  name)

Returns the specification with the indicated name, or NULL if the name is not used. Use get_array_with() to determine which array this column is associated with.

◆ getColumn() [2/2]

const GeomVertexColumn getColumn ( int  i)

Returns the ith column of the specification, across all arrays.

◆ getColumns()

list getColumns ( )

◆ getMorphBase()

const InternalName getMorphBase ( int  n)

Returns the name of the base column that the nth morph modifies. This column will also be defined within the format, and can be retrieved via get_array_with() and/or get_column().

This may only be called after the format has been registered.

◆ getMorphBases()

list getMorphBases ( )

◆ getMorphDelta()

const InternalName getMorphDelta ( int  n)

Returns the name of the column that defines the nth morph. This contains the delta offsets that are to be applied to the column defined by get_morph_base(). This column will be defined within the format, and can be retrieved via get_array_with() and/or get_column().

This may only be called after the format has been registered.

◆ getMorphDeltas()

list getMorphDeltas ( )

◆ getMorphSlider()

const InternalName getMorphSlider ( int  n)

Returns the slider name associated with the nth morph column. This is the name of the slider that will control the morph, and should be defined within the SliderTable associated with the GeomVertexData.

This may only be called after the format has been registered.

◆ getMorphSliders()

list getMorphSliders ( )

◆ getNumArrays()

int getNumArrays ( )

Returns the number of individual arrays required by the format. If the array data is completely interleaved, this will be 1; if it is completely parallel, this will be the same as the number of data types.

◆ getNumColumns()

int getNumColumns ( )

Returns the total number of different columns in the specification, across all arrays.

◆ getNumMorphs()

int getNumMorphs ( )

Returns the number of columns within the format that represent morph deltas.

This may only be called after the format has been registered.

◆ getNumPoints()

int getNumPoints ( )

Returns the number of columns within the format that represent points in space.

This may only be called after the format has been registered.

◆ getNumTexcoords()

int getNumTexcoords ( )

Returns the number of columns within the format that represent texture coordinates.

This may only be called after the format has been registered.

◆ getNumVectors()

int getNumVectors ( )

Returns the number of columns within the format that represent directional vectors.

This may only be called after the format has been registered.

◆ getPoint()

const InternalName getPoint ( int  n)

Returns the name of the nth point column. This represents a point in space, which should be transformed by any spatial transform matrix.

This may only be called after the format has been registered.

◆ getPoints()

list getPoints ( )

◆ getPostAnimatedFormat()

const GeomVertexFormat getPostAnimatedFormat ( )

Returns a suitable vertex format for sending the animated vertices to the graphics backend. This is the same format as the source format, with the CPU-animation data elements removed.

This may only be called after the format has been registered. The return value will have been already registered.

◆ getTexcoord()

const InternalName getTexcoord ( int  n)

Returns the name of the nth texcoord column. This represents a texture coordinate.

This may only be called after the format has been registered.

◆ getTexcoords()

list getTexcoords ( )

◆ getUnionFormat()

const GeomVertexFormat getUnionFormat ( const GeomVertexFormat  other)

Returns a new GeomVertexFormat that includes all of the columns defined in either this GeomVertexFormat or the other one. If any column is defined in both formats with different sizes (for instance, texcoord2 vs. texcoord3), the new format will include the larger of the two definitions.

This may only be called after both source formats have been registered. The return value will also have been already registered.

◆ getV3()

static const GeomVertexFormat getV3 ( )
static

Returns a standard vertex format with just a 3-component vertex position.

◆ getV3c4()

static const GeomVertexFormat getV3c4 ( )
static

Returns a standard vertex format with a 4-component color and a 3-component vertex position.

◆ getV3c4t2()

static const GeomVertexFormat getV3c4t2 ( )
static

Returns a standard vertex format with a 2-component texture coordinate pair, a 4-component color, and a 3-component vertex position.

◆ getV3cp()

static const GeomVertexFormat getV3cp ( )
static

Returns a standard vertex format with a packed color and a 3-component vertex position.

◆ getV3cpt2()

static const GeomVertexFormat getV3cpt2 ( )
static

Returns a standard vertex format with a 2-component texture coordinate pair, a packed color, and a 3-component vertex position.

◆ getV3n3()

static const GeomVertexFormat getV3n3 ( )
static

Returns a standard vertex format with a 3-component normal and a 3-component vertex position.

◆ getV3n3c4()

static const GeomVertexFormat getV3n3c4 ( )
static

Returns a standard vertex format with a 4-component color, a 3-component normal, and a 3-component vertex position.

◆ getV3n3c4t2()

static const GeomVertexFormat getV3n3c4t2 ( )
static

Returns a standard vertex format with a 2-component texture coordinate pair, a 4-component color, a 3-component normal, and a 3-component vertex position.

◆ getV3n3cp()

static const GeomVertexFormat getV3n3cp ( )
static

Returns a standard vertex format with a packed color, a 3-component normal, and a 3-component vertex position.

◆ getV3n3cpt2()

static const GeomVertexFormat getV3n3cpt2 ( )
static

Returns a standard vertex format with a 2-component texture coordinate pair, a packed color, a 3-component normal, and a 3-component vertex position.

◆ getV3n3t2()

static const GeomVertexFormat getV3n3t2 ( )
static

Returns a standard vertex format with a 2-component texture coordinate pair, a 3-component normal, and a 3-component vertex position.

◆ getV3t2()

static const GeomVertexFormat getV3t2 ( )
static

Returns a standard vertex format with a 2-component texture coordinate pair and a 3-component vertex position.

◆ getVector()

const InternalName getVector ( int  n)

Returns the name of the nth vector column. This represents a directional vector, which should be transformed by any spatial transform matrix as a vector.

This may only be called after the format has been registered.

◆ getVectors()

list getVectors ( )

◆ hasColumn()

bool hasColumn ( const InternalName  name)

Returns true if the format has the named column, false otherwise.

◆ insertArray()

insertArray ( int  array,
const GeomVertexArrayFormat  array_format 
)

Adds the indicated array definition to the list of arrays at the indicated position. This works just like add_array(), except that you can specify which array index the new array should have.

This may not be called once the format has been registered.

◆ isRegistered()

bool isRegistered ( )

Returns true if this format has been registered, false if it has not. It may not be used for a Geom until it has been registered, but once registered, it may no longer be modified.

◆ maybeAlignColumnsForAnimation()

maybeAlignColumnsForAnimation ( )

Calls align_columns_for_animation() if this format's AnimationSpec indicates that it contains animated vertices, and if vertex-animation-align-16 is true.

◆ modifyArray()

GeomVertexArrayFormat modifyArray ( int  array)

Returns a modifiable pointer to the indicated array. This means duplicating it if it is shared or registered.

This may not be called once the format has been registered.

◆ operator=()

GeomVertexFormat operator= ( const GeomVertexFormat  copy)

◆ output()

output ( Ostream  out)

◆ packColumns()

packColumns ( )

Removes wasted space between columns.

◆ registerFormat() [1/2]

static const GeomVertexFormat registerFormat ( const GeomVertexArrayFormat  format)
static

This flavor of register_format() implicitly creates a one-array vertex format from the array definition.

◆ registerFormat() [2/2]

static const GeomVertexFormat registerFormat ( const GeomVertexFormat  format)
static

Adds the indicated format to the registry, if there is not an equivalent format already there; in either case, returns the pointer to the equivalent format now in the registry.

This must be called before a format may be used in a Geom. After this call, you should discard the original pointer you passed in (which may or may not now be invalid) and let its reference count decrement normally; you should use only the returned value from this point on.

◆ removeArray()

removeArray ( int  array)

Removes the nth array from the format.

This may not be called once the format has been registered.

◆ removeColumn()

removeColumn ( const InternalName  name,
bool  keep_empty_array 
)

Removes the named column from the format, from whichever array it exists in. If there are other columns remaining in the array, the array is left with a gap where the column used to be; if this was the only column in the array, the array is removed (unless keep_empty_array is true).

This may not be called once the format has been registered.

◆ removeEmptyArrays()

removeEmptyArrays ( )

Removes the arrays that define no columns.

This may not be called once the format has been registered.

◆ setAnimation()

setAnimation ( const GeomVertexAnimationSpec  animation)

Resets the GeomVertexAnimationSpec that indicates how this format's vertices are set up for animation. You should also, of course, change the columns in the tables accordingly.

This may not be called once the format has been registered.

◆ setArray()

setArray ( int  array,
const GeomVertexArrayFormat  format 
)

Replaces the definition of the indicated array.

This may not be called once the format has been registered.

◆ unref()

bool unref ( )

This method overrides ReferenceCount::unref() to unregister the object when its reference count goes to zero.

◆ write()

write ( Ostream  out,
int  indent_level 
)

◆ writeWithData()

writeWithData ( Ostream  out,
int  indent_level,
const GeomVertexData  data 
)