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MeshDrawer Class Reference

Mesh drawer creates a single geom object that can be shaped with different draw commands. More...

#include "meshDrawer.h"

Inheritance diagram for MeshDrawer:
TypedObject MemoryBase

Public Member Functions

 MeshDrawer ()
 Creates the MeshDrawer low level system. More...
 
 ~MeshDrawer ()
 Destroys the MeshDrawer low level system. More...
 
void begin (NodePath camera, NodePath render)
 Pass the current camera node and the root node. More...
 
void billboard (const LVector3 &pos, const LVector4 &frame, PN_stdfloat size, const LVector4 &color)
 Draws a billboard - particle with no rotation. More...
 
void blended_particle (const LVector3 &pos, const LVector4 &frame1, const LVector4 &frame2, PN_stdfloat blend, PN_stdfloat size, const LVector4 &color, PN_stdfloat rotation)
 Works just like particle but accepts 2 frames and a blend (from 0 to 1) component between them Frame contains u,v,u-size,v-size quadruple. More...
 
void cross_segment (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat thickness, const LVector4 &color)
 Draws a segment a line with a thickness. More...
 
void end ()
 Finish the drawing and clearing off the remaining vertexes. More...
 
void explosion (const LVector3 &pos, const LVector4 &frame, PN_stdfloat size, const LVector4 &color, int seed, int number, PN_stdfloat distance)
 Draws number of particles in a sphere like emitter. More...
 
virtual TypeHandle force_init_type ()
 
void geometry (NodePath node)
 Draws the geometry that is inside this node path into the MeshDrawer object. More...
 
int get_budget ()
 Gets the total triangle budget of the drawer. More...
 
NodePath get_root ()
 Returns the root NodePath. More...
 
virtual TypeHandle get_type () const
 
void link_segment (const LVector3 &pos, const LVector4 &frame, PN_stdfloat thickness, const LVector4 &color)
 Stars or continues linked segment. More...
 
void link_segment_end (const LVector4 &frame, const LVector4 &color)
 Finish drawing linked segments, needs at least two calls to link_segment before it can end the linked segment. More...
 
void particle (const LVector3 &pos, const LVector4 &frame, PN_stdfloat size, const LVector4 &color, PN_stdfloat rotation)
 Draws a particle that is sort of like a bill board but has an extra rotation component. More...
 
void segment (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat thickness, const LVector4 &color)
 Draws a segment a line with a thickness. More...
 
void set_budget (int budget)
 Sets the total triangle budget of the drawer. More...
 
void stream (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat size, const LVector4 &color, int number, PN_stdfloat offset)
 Draws a number of particles in a big line with a shift dictated by the offset. More...
 
void tri (const LVector3 &v1, const LVector4 &c1, const LVector2 &uv1, const LVector3 &v2, const LVector4 &c2, const LVector2 &uv2, const LVector3 &v3, const LVector4 &c3, const LVector2 &uv3)
 Draws a triangle with the given parameters. More...
 
void uneven_segment (const LVector3 &start, const LVector3 &stop, const LVector4 &frame, PN_stdfloat thickness_start, const LVector4 &color_start, PN_stdfloat thickness_stop, const LVector4 &color_stop)
 Draws a segment a line with different thickness and color on both sides. More...
 
- Public Member Functions inherited from TypedObject
 TypedObject (const TypedObject &copy)
 
TypedObjectas_typed_object ()
 Returns the object, upcast (if necessary) to a TypedObject pointer. More...
 
const TypedObjectas_typed_object () const
 Returns the object, upcast (if necessary) to a TypedObject pointer. More...
 
int get_best_parent_from_Set (const std::set< int > &) const
 
int get_type_index () const
 Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More...
 
bool is_exact_type (TypeHandle handle) const
 Returns true if the current object is the indicated type exactly. More...
 
bool is_of_type (TypeHandle handle) const
 Returns true if the current object is or derives from the indicated type. More...
 
void operator= (const TypedObject &copy)
 

Static Public Member Functions

static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from TypedObject
static TypeHandle get_class_type ()
 
static void init_type ()
 This function is declared non-inline to work around a compiler bug in g++ 2.96. More...
 

Detailed Description

Mesh drawer creates a single geom object that can be shaped with different draw commands.

This is an efficient way to render bunch of billboards, particles, fast changing triangles. Its implemented by recycling same geom over and over again. Max budget specifies how many triangles are allowed. Some uses of this class can be : particle system, radar icons, health bars, 2d icons, 2d ui, bullets, missile trails. Any that can be drawn with triangles can be drawn with this class. At the low level this uses the GeomVertexRewriter's. The internal geom consists of vertex, normal, uv and color channels.

Definition at line 58 of file meshDrawer.h.

Constructor & Destructor Documentation

MeshDrawer::MeshDrawer ( )
inline

Creates the MeshDrawer low level system.

Definition at line 23 of file meshDrawer.I.

MeshDrawer::~MeshDrawer ( )
inline

Destroys the MeshDrawer low level system.

Definition at line 41 of file meshDrawer.I.

References NodePath::remove_node().

Member Function Documentation

void MeshDrawer::begin ( NodePath  camera,
NodePath  render 
)

Pass the current camera node and the root node.

Passing the camera is required to generate bill boards that face it.

Definition at line 90 of file meshDrawer.cxx.

References NodePath::get_error_type(), NodePath::get_pos(), and NodePath::get_relative_vector().

void MeshDrawer::billboard ( const LVector3 pos,
const LVector4 frame,
PN_stdfloat  size,
const LVector4 _color 
)

Draws a billboard - particle with no rotation.

Billboards always face the camera. Frame contains u,v,u-size,v-size quadruple.

Definition at line 214 of file meshDrawer.cxx.

References tri().

Referenced by stream().

void MeshDrawer::blended_particle ( const LVector3 pos,
const LVector4 frame1,
const LVector4 frame2,
PN_stdfloat  blend,
PN_stdfloat  size,
const LVector4 color,
PN_stdfloat  rotation 
)

Works just like particle but accepts 2 frames and a blend (from 0 to 1) component between them Frame contains u,v,u-size,v-size quadruple.

Definition at line 195 of file meshDrawer.cxx.

References particle().

void MeshDrawer::cross_segment ( const LVector3 start,
const LVector3 stop,
const LVector4 frame,
PN_stdfloat  thickness,
const LVector4 color 
)

Draws a segment a line with a thickness.

This segment does not use the bill boarding behavior and instead draws 2 planes in a cross. Stars at start and ends at stop. Frame contains u,v,u-size,v-size quadruple.

Definition at line 260 of file meshDrawer.cxx.

References tri().

void MeshDrawer::end ( )

Finish the drawing and clearing off the remaining vertexes.

Definition at line 137 of file meshDrawer.cxx.

References GeomVertexWriter::add_data3().

void MeshDrawer::explosion ( const LVector3 pos,
const LVector4 frame,
PN_stdfloat  size,
const LVector4 _color,
int  seed,
int  number,
PN_stdfloat  distance 
)

Draws number of particles in a sphere like emitter.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 345 of file meshDrawer.cxx.

References LVecBase3f::normalize(), and particle().

void MeshDrawer::geometry ( NodePath  draw_node)

Draws the geometry that is inside this node path into the MeshDrawer object.

This performs a similar functions as RigidBodyCombiner but for very dynamic situations that share the same texture like physcal chunks of explosions. It can be a little slow

Definition at line 391 of file meshDrawer.cxx.

References NodePath::find_all_matches(), GeomVertexReader::get_data2(), GeomVertexReader::get_data3(), NodePath::get_error_type(), NodePathCollection::get_num_paths(), NodePathCollection::get_path(), NodePath::get_relative_point(), NodePath::node(), GeomVertexReader::set_row_unsafe(), and tri().

int MeshDrawer::get_budget ( )
inline

Gets the total triangle budget of the drawer.

Definition at line 81 of file meshDrawer.I.

NodePath MeshDrawer::get_root ( )
inline

Returns the root NodePath.

You should use this node to reparent mesh drawer onto the scene might also want to disable depth draw or enable transparency.

Definition at line 58 of file meshDrawer.I.

void MeshDrawer::link_segment ( const LVector3 pos,
const LVector4 frame,
PN_stdfloat  thickness,
const LVector4 color 
)

Stars or continues linked segment.

Control position, frame, thickness and color with parameters. Frame contains u,v,u-size,v-size quadruple.

Definition at line 458 of file meshDrawer.cxx.

References NodePath::get_error_type(), NodePath::get_relative_point(), NodePath::node(), and tri().

Referenced by segment().

void MeshDrawer::link_segment_end ( const LVector4 frame,
const LVector4 color 
)

Finish drawing linked segments, needs at least two calls to link_segment before it can end the linked segment.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 560 of file meshDrawer.cxx.

References tri().

Referenced by segment().

void MeshDrawer::particle ( const LVector3 pos,
const LVector4 frame,
PN_stdfloat  size,
const LVector4 color,
PN_stdfloat  rotation 
)

Draws a particle that is sort of like a bill board but has an extra rotation component.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 163 of file meshDrawer.cxx.

References tri().

Referenced by blended_particle(), and explosion().

void MeshDrawer::segment ( const LVector3 start,
const LVector3 stop,
const LVector4 frame,
PN_stdfloat  thickness,
const LVector4 color 
)

Draws a segment a line with a thickness.

That has billboarding effect. Frame contains u,v,u-size,v-size quadruple.

Definition at line 245 of file meshDrawer.cxx.

References link_segment(), and link_segment_end().

void MeshDrawer::set_budget ( int  total_budget)
inline

Sets the total triangle budget of the drawer.

This will not be exceeded. Don't set some thing too large because it will be slow

Definition at line 70 of file meshDrawer.I.

void MeshDrawer::stream ( const LVector3 start,
const LVector3 stop,
const LVector4 frame,
PN_stdfloat  size,
const LVector4 _color,
int  number,
PN_stdfloat  offset 
)

Draws a number of particles in a big line with a shift dictated by the offset.

Frame contains u,v,u-size,v-size quadruple.

Definition at line 365 of file meshDrawer.cxx.

References billboard(), LVecBase3f::length(), and LVecBase3f::normalize().

void MeshDrawer::tri ( const LVector3 v1,
const LVector4 c1,
const LVector2 uv1,
const LVector3 v2,
const LVector4 c2,
const LVector2 uv2,
const LVector3 v3,
const LVector4 c3,
const LVector2 uv3 
)
inline
void MeshDrawer::uneven_segment ( const LVector3 start,
const LVector3 stop,
const LVector4 frame,
PN_stdfloat  thickness_start,
const LVector4 color_start,
PN_stdfloat  thickness_stop,
const LVector4 color_stop 
)

Draws a segment a line with different thickness and color on both sides.

Stars at start and ends at stop. Frame contains u,v,u-size,v-size quadruple.

Definition at line 305 of file meshDrawer.cxx.

References tri().


The documentation for this class was generated from the following files: