Panda3D
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The method used in creating the motion trail is based on taking samples of time and transformations (the position and orientation matrix) in real-time. More...
#include "cMotionTrail.h"
Public Types | |
typedef plist< CMotionTrailFrame > | FrameList |
typedef epvector < CMotionTrailVertex > | VertexList |
Public Member Functions | |
CMotionTrail () | |
Constructor. | |
~CMotionTrail () | |
Destructor. | |
void | add_geometry_quad (LVector3 &v0, LVector3 &v1, LVector3 &v2, LVector3 &v3, LVector4 &c0, LVector4 &c1, LVector4 &c2, LVector4 &c3, LVector2 &t0, LVector2 &t1, LVector2 &t2, LVector2 &t3) |
LVector3 vertex version. | |
void | add_geometry_quad (LVector4 &v0, LVector4 &v1, LVector4 &v2, LVector4 &v3, LVector4 &c0, LVector4 &c1, LVector4 &c2, LVector4 &c3, LVector2 &t0, LVector2 &t1, LVector2 &t2, LVector2 &t3) |
LVector4 vertex version. | |
void | add_vertex (LVector4 *vertex, LVector4 *start_color, LVector4 *end_color, PN_stdfloat v) |
Add a vertex. | |
void | begin_geometry () |
int | check_for_update (PN_stdfloat current_time) |
Check if a sample can be submitted. | |
void | enable (bool enable) |
Enable/disable the motion trail. | |
void | end_geometry () |
virtual TypeHandle | force_init_type () |
virtual TypeHandle | get_type () const |
PT (GeomNode) _geom_node | |
PT (GeomVertexData) _vertex_data | |
PT (GeomTriangles) _triangles | |
void | reset () |
Reset the frame sample history. | |
void | reset_vertex_list () |
Reset the vertex list. | |
void | set_geom_node (PT(GeomNode) geom_node) |
Set the GeomNode. | |
void | set_parameters (PN_stdfloat sampling_time, PN_stdfloat time_window, bool use_texture, bool calculate_relative_matrix, bool use_nurbs, PN_stdfloat resolution_distance) |
Set motion trail parameters. | |
void | update_motion_trail (PN_stdfloat current_time, LMatrix4 *transform) |
See class header comments. | |
Static Public Member Functions | |
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. | |
Public Attributes | |
int | _active |
int | _calculate_relative_matrix |
PN_stdfloat | _color_scale |
GeomVertexWriter | _color_writer |
int | _enable |
int | _fade |
PN_stdfloat | _fade_color_scale |
int | _fade_end |
PN_stdfloat | _fade_start_time |
PN_stdfloat | _fade_time |
FrameList | _frame_list |
PN_stdfloat | _last_update_time |
int | _pause |
PN_stdfloat | _pause_time |
PN_stdfloat | _resolution_distance |
PN_stdfloat | _sampling_time |
bool | _square_t |
GeomVertexWriter | _texture_writer |
PN_stdfloat | _time_window |
bool | _use_nurbs |
bool | _use_texture |
CMotionTrailVertex * | _vertex_array |
int | _vertex_index |
VertexList | _vertex_list |
GeomVertexWriter | _vertex_writer |
The method used in creating the motion trail is based on taking samples of time and transformations (the position and orientation matrix) in real-time.
The method also requires a number of vertices (positions) that determines "shape" of the motion trail (i.e. the edge of a blade). A start color and end color is also required for each vertex. The color is interpolated as function of time. The colors are typically used to fade the motion trail so the end color is typically black.
The vertices are submitted via the "add_vertex" function. For each frame, a sample is submited via the "update_motion_trail" function. During the "update_motion_trail" function, the motion trail geometry is created dynamically from the sample history and the vertices.
The user must specifiy a GeomNode via "set_geom_node".
The duration of the sample history is specified by a time window. A larger time window creates longer motion trails (given constant speed). Samples that are no longer within the time window are automatically discarded.
The nurbs option can be used to create smooth interpolated curves from the samples. The nurbs option is useful for animations that lack sampling to begin with, animations that move very quickly, or low frame rates.
The texture option be used to create variation to the motion trail. The u coordinate of the texture corresponds to time and the v coordinate corresponds to the "shape" of the motion trail.
Definition at line 86 of file cMotionTrail.h.
Constructor.
Definition at line 29 of file cMotionTrail.cxx.
Destructor.
Definition at line 77 of file cMotionTrail.cxx.
void CMotionTrail::add_geometry_quad | ( | LVector3 & | v0, |
LVector3 & | v1, | ||
LVector3 & | v2, | ||
LVector3 & | v3, | ||
LVector4 & | c0, | ||
LVector4 & | c1, | ||
LVector4 & | c2, | ||
LVector4 & | c3, | ||
LVector2 & | t0, | ||
LVector2 & | t1, | ||
LVector2 & | t2, | ||
LVector2 & | t3 | ||
) |
LVector3 vertex version.
Definition at line 249 of file cMotionTrail.cxx.
References GeomVertexWriter::add_data2(), GeomVertexWriter::add_data3(), GeomVertexWriter::add_data4(), and add_vertex().
Referenced by update_motion_trail().
void CMotionTrail::add_geometry_quad | ( | LVector4 & | v0, |
LVector4 & | v1, | ||
LVector4 & | v2, | ||
LVector4 & | v3, | ||
LVector4 & | c0, | ||
LVector4 & | c1, | ||
LVector4 & | c2, | ||
LVector4 & | c3, | ||
LVector2 & | t0, | ||
LVector2 & | t1, | ||
LVector2 & | t2, | ||
LVector2 & | t3 | ||
) |
LVector4 vertex version.
Definition at line 290 of file cMotionTrail.cxx.
References GeomVertexWriter::add_data2(), GeomVertexWriter::add_data3(), GeomVertexWriter::add_data4(), and add_vertex().
void CMotionTrail::add_vertex | ( | LVector4 * | vertex, |
LVector4 * | start_color, | ||
LVector4 * | end_color, | ||
PN_stdfloat | v | ||
) |
int CMotionTrail::check_for_update | ( | PN_stdfloat | current_time | ) |
Check if a sample can be submitted.
Definition at line 183 of file cMotionTrail.cxx.
void CMotionTrail::enable | ( | bool | enable | ) |
Enable/disable the motion trail.
Definition at line 107 of file cMotionTrail.cxx.
static void CMotionTrail::init_type | ( | ) | [inline, static] |
This function is declared non-inline to work around a compiler bug in g++ 2.96.
Making it inline seems to cause problems in the optimizer.
Reimplemented from TypedReferenceCount.
Definition at line 161 of file cMotionTrail.h.
References TypedReferenceCount::init_type().
void CMotionTrail::reset | ( | ) |
Reset the frame sample history.
Definition at line 87 of file cMotionTrail.cxx.
Referenced by update_motion_trail().
void CMotionTrail::reset_vertex_list | ( | ) |
Reset the vertex list.
Definition at line 97 of file cMotionTrail.cxx.
void CMotionTrail::set_geom_node | ( | PT(GeomNode) | geom_node | ) |
Set the GeomNode.
Definition at line 117 of file cMotionTrail.cxx.
void CMotionTrail::set_parameters | ( | PN_stdfloat | sampling_time, |
PN_stdfloat | time_window, | ||
bool | use_texture, | ||
bool | calculate_relative_matrix, | ||
bool | use_nurbs, | ||
PN_stdfloat | resolution_distance | ||
) |
Set motion trail parameters.
sampling_time = Can be used to specify a lower sampling rate than the frame rate. Use 0.0 with nurbs.
time_window = a component for the "length" of the motion trail. The motion trail length = time_window * velocity of the object.
use_texture = texture option on/off.
calculate_relative_matrix = calculate relative matrix on/off.
use_nurbs = nurbs option on/off
resolution_distance = the distance used to determine the number of geometry samples. samples = motion trail length / resolution_distance. Applicable only if nurbs is on.
Definition at line 167 of file cMotionTrail.cxx.
void CMotionTrail::update_motion_trail | ( | PN_stdfloat | current_time, |
LMatrix4 * | transform | ||
) |
See class header comments.
Definition at line 353 of file cMotionTrail.cxx.
References add_geometry_quad(), LMatrix4f::invert_in_place(), LVecBase3f::length(), reset(), and LMatrix4f::xform().