37 _fade_start_time = 0.0f;
38 _fade_color_scale = 1.0f;
40 _last_update_time = 0.0f;
42 _vertex_list.clear ( );
43 _frame_list.clear ( );
51 _calculate_relative_matrix =
false;
55 _resolution_distance = 0.5f;
62 _vertex_data =
nullptr;
65 _vertex_array =
nullptr;
81 _frame_list.clear ( );
89 _vertex_list.clear ( );
105 _geom_node = geom_node;
112 add_vertex (LVector4 *vertex, LVector4 *start_color, LVector4 *end_color, PN_stdfloat v) {
116 motion_trail_vertex._vertex = *vertex;
117 motion_trail_vertex._start_color = *start_color;
118 motion_trail_vertex._end_color = *end_color;
119 motion_trail_vertex._v = v;
123 _vertex_list.push_back (motion_trail_vertex);
146 set_parameters (PN_stdfloat sampling_time, PN_stdfloat time_window,
bool use_texture,
bool calculate_relative_matrix,
bool use_nurbs, PN_stdfloat resolution_distance) {
148 _sampling_time = sampling_time;
149 _time_window = time_window;
150 _use_texture = use_texture;
151 _calculate_relative_matrix = calculate_relative_matrix;
152 _use_nurbs = use_nurbs;
153 _resolution_distance = resolution_distance;
165 if ((current_time - _last_update_time) >= _sampling_time) {
171 state = state && _enable;
176 PN_stdfloat one_minus_x (PN_stdfloat x) {
204 _vertex_writer.
clear();
205 _color_writer.
clear();
206 _texture_writer.
clear();
208 _vertex_data =
new GeomVertexData (
"vertices", format, Geom::UH_static);
222 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) {
242 vertex_index = _vertex_index;
247 _triangles -> close_primitive ( );
252 _triangles -> close_primitive ( );
261 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) {
263 _vertex_writer.
add_data3 (v0 [0], v0 [1], v0 [2]);
264 _vertex_writer.
add_data3 (v1 [0], v1 [1], v1 [2]);
265 _vertex_writer.
add_data3 (v2 [0], v2 [1], v2 [2]);
266 _vertex_writer.
add_data3 (v3 [0], v3 [1], v3 [2]);
281 vertex_index = _vertex_index;
286 _triangles -> close_primitive ( );
291 _triangles -> close_primitive ( );
299 void CMotionTrail::end_geometry ( ) {
301 if (state ==
nullptr) {
302 state = RenderState::make(ColorAttrib::make_vertex());
307 geometry =
new Geom (_vertex_data);
308 geometry -> add_primitive (_triangles);
311 _geom_node -> remove_all_geoms ( );
312 _geom_node -> add_geom (geometry, state);
327 total_frames = _frame_list.size ( );
328 if (total_frames >= 1) {
329 FrameList::iterator frame_iterator;
332 frame_iterator = _frame_list.begin ( );
333 motion_trail_frame = *frame_iterator;
334 if (motion_trail_frame._transform == UnalignedLMatrix4(*transform)) {
341 PN_stdfloat color_scale;
342 LMatrix4 start_transform;
343 LMatrix4 end_transform;
344 LMatrix4 inverse_matrix;
346 total_vertices = _vertex_list.size ( );
347 color_scale = _color_scale;
349 PN_stdfloat elapsed_time;
351 elapsed_time = current_time - _fade_start_time;
352 if (elapsed_time < 0.0) {
355 if (elapsed_time < _fade_time) {
356 color_scale = (1.0f - (elapsed_time / _fade_time)) * color_scale;
364 _last_update_time = current_time;
367 PN_stdfloat minimum_time;
369 minimum_time = current_time - _time_window;
373 while (!_frame_list.empty()) {
374 motion_trail_frame = _frame_list.back();
375 if (motion_trail_frame._time >= minimum_time) {
379 _frame_list.pop_back ( );
386 motion_trail_frame._time = current_time;
387 motion_trail_frame._transform = *transform;
389 _frame_list.push_front(motion_trail_frame);
393 total_frames = _frame_list.size ( );
396 printf (
"update_motion_trail, total_frames = %d, total_vertices = %d, nurbs = %d, _calculate_relative_matrix = %d \n", total_frames, total_vertices, _use_nurbs, _calculate_relative_matrix);
399 if ((total_frames >= 2) && (total_vertices >= 2)) {
401 PN_stdfloat minimum_time;
402 PN_stdfloat delta_time;
405 VertexList::iterator vertex_iterator;
410 for (vertex_iterator = _vertex_list.begin ( ); vertex_iterator != _vertex_list.end ( ); vertex_iterator++) {
411 _vertex_array [index] = *vertex_iterator;
416 this -> begin_geometry ( );
418 total_segments = total_frames - 1;
420 last_motion_trail_frame = _frame_list.back();
421 minimum_time = last_motion_trail_frame._time;
422 delta_time = current_time - minimum_time;
424 if (_calculate_relative_matrix) {
425 inverse_matrix = *transform;
426 inverse_matrix.invert_in_place ( );
429 if (_use_nurbs && (total_frames >= 5)) {
432 int total_vertex_segments;
433 PN_stdfloat total_distance;
441 total_vertex_segments = total_vertices - 1;
442 total_distance = 0.0f;
450 for (index = 0; index < total_vertices; index++) {
451 motion_trail_vertex = &_vertex_array [index];
452 nurbs_curve_evaluator = motion_trail_vertex -> _nurbs_curve_evaluator;
453 nurbs_curve_evaluator -> set_order (4);
454 nurbs_curve_evaluator ->
reset (total_segments);
465 FrameList::iterator frame_iterator;
466 frame_iterator = _frame_list.begin ( );
467 while (segment_index < total_segments) {
468 int vertex_segement_index;
470 motion_trail_frame_start = *frame_iterator;
472 motion_trail_frame_end = *frame_iterator;
474 if (_calculate_relative_matrix) {
475 start_transform.multiply (motion_trail_frame_start._transform, inverse_matrix);
476 end_transform.multiply (motion_trail_frame_end._transform, inverse_matrix);
479 start_transform = motion_trail_frame_start._transform;
480 end_transform = motion_trail_frame_end._transform;
487 motion_trail_vertex_start = &_vertex_array [0];
489 v0 = start_transform.xform (motion_trail_vertex_start -> _vertex);
490 v2 = end_transform.xform (motion_trail_vertex_start -> _vertex);
492 nurbs_curve_evaluator = motion_trail_vertex_start -> _nurbs_curve_evaluator;
493 nurbs_curve_evaluator -> set_vertex (segment_index, v0);
495 vertex_segement_index = 0;
496 while (vertex_segement_index < total_vertex_segments) {
497 motion_trail_vertex_start = &_vertex_array [vertex_segement_index];
498 motion_trail_vertex_end = &_vertex_array [vertex_segement_index + 1];
500 v1 = start_transform.xform (motion_trail_vertex_end -> _vertex);
501 v3 = end_transform.xform (motion_trail_vertex_end -> _vertex);
503 nurbs_curve_evaluator = motion_trail_vertex_end -> _nurbs_curve_evaluator;
505 nurbs_curve_evaluator -> set_vertex (segment_index, v1);
506 if (vertex_segement_index == (total_vertex_segments - 1)) {
507 PN_stdfloat distance;
510 vector.set (v[0], v[1], v[2]);
511 distance = vector.length();
512 total_distance += distance;
515 vertex_segement_index += 1;
525 for (index = 0; index < total_vertices; index++) {
531 motion_trail_vertex = &_vertex_array [index];
533 nurbs_curve_evaluator = motion_trail_vertex -> _nurbs_curve_evaluator;
534 nurbs_curve_result = nurbs_curve_evaluator -> evaluate ( );
535 nurbs_curve_result_array [index] = nurbs_curve_result;
538 PN_stdfloat nurbs_start_t;
539 PN_stdfloat nurbs_end_t;
541 nurbs_start_t = nurbs_curve_result -> get_start_t();
542 nurbs_end_t = nurbs_curve_result -> get_end_t();
544 printf (
"nurbs_start_t %f, nurbs_end_t %f \n", nurbs_start_t, nurbs_end_t);
549 PN_stdfloat total_curve_segments;
551 total_curve_segments = (total_distance / _resolution_distance);
552 if (total_curve_segments < total_segments) {
553 total_curve_segments = total_segments;
572 LVector4 vertex_start_color;
573 LVector4 vertex_end_color;
575 PN_stdfloat curve_segment_index;
577 curve_segment_index = 0.0;
578 while (curve_segment_index < total_curve_segments) {
584 PN_stdfloat color_start_t;
585 PN_stdfloat color_end_t;
587 int vertex_segement_index;
594 vertex_segement_index = 0;
596 st = curve_segment_index / total_curve_segments;
597 et = (curve_segment_index + 1.0) / total_curve_segments;
607 motion_trail_vertex_start = &_vertex_array [0];
609 vertex_start_color = motion_trail_vertex_start -> _end_color + (motion_trail_vertex_start -> _start_color - motion_trail_vertex_start -> _end_color);
611 color_start_t = color_scale * start_t;
612 color_end_t = color_scale * end_t;
614 c0 = vertex_start_color * one_minus_x (color_start_t);
615 c2 = vertex_start_color * one_minus_x (color_end_t);
617 t0.set (one_minus_x (st), motion_trail_vertex_start -> _v);
618 t2.set (one_minus_x (et), motion_trail_vertex_start -> _v);
620 while (vertex_segement_index < total_vertex_segments) {
622 PN_stdfloat start_nurbs_start_t;
623 PN_stdfloat start_nurbs_end_t;
624 PN_stdfloat end_nurbs_start_t;
625 PN_stdfloat end_nurbs_end_t;
627 motion_trail_vertex_start = &_vertex_array [vertex_segement_index];
628 motion_trail_vertex_end = &_vertex_array [vertex_segement_index + 1];
630 start_nurbs_curve_result = nurbs_curve_result_array [vertex_segement_index];
631 end_nurbs_curve_result = nurbs_curve_result_array [vertex_segement_index + 1];
633 start_nurbs_start_t = start_nurbs_curve_result -> get_start_t();
634 start_nurbs_end_t = start_nurbs_curve_result -> get_end_t();
635 end_nurbs_start_t = end_nurbs_curve_result -> get_start_t();
636 end_nurbs_end_t = end_nurbs_curve_result -> get_end_t();
638 PN_stdfloat start_delta_t;
639 PN_stdfloat end_delta_t;
641 start_delta_t = (start_nurbs_end_t - start_nurbs_start_t);
642 end_delta_t = (end_nurbs_end_t - end_nurbs_start_t);
644 start_nurbs_curve_result -> eval_point (start_nurbs_start_t + (start_delta_t * st), v0);
645 end_nurbs_curve_result -> eval_point (end_nurbs_start_t + (end_delta_t * st), v1);
647 start_nurbs_curve_result -> eval_point (start_nurbs_start_t + (start_delta_t * et), v2);
648 end_nurbs_curve_result -> eval_point (end_nurbs_start_t + (end_delta_t * et), v3);
651 vertex_end_color = motion_trail_vertex_end -> _end_color + (motion_trail_vertex_end -> _start_color - motion_trail_vertex_end -> _end_color);
653 c1 = vertex_end_color * one_minus_x (color_start_t);
654 c3 = vertex_end_color * one_minus_x (color_end_t);
657 t1.set (one_minus_x (st), motion_trail_vertex_end -> _v);
658 t3.set (one_minus_x (et), motion_trail_vertex_end -> _v);
660 this ->
add_geometry_quad (v0, v1, v2, v3, c0, c1, c2, c3, t0, t1, t2, t3);
669 vertex_segement_index += 1;
672 curve_segment_index += 1.0;
676 for (index = 0; index < total_vertices; index++) {
677 nurbs_curve_result_array [index] =
nullptr;
680 delete[] nurbs_curve_result_array;
686 int vertex_segment_index;
687 int total_vertex_segments;
693 PN_stdfloat color_start_t;
694 PN_stdfloat color_end_t;
711 LVector4 vertex_start_color;
712 LVector4 vertex_end_color;
718 FrameList::iterator frame_iterator;
719 frame_iterator = _frame_list.begin ( );
720 while (segment_index < total_segments) {
725 motion_trail_frame_start = *frame_iterator;
727 motion_trail_frame_end = *frame_iterator;
729 start_t = (motion_trail_frame_start._time - minimum_time) / delta_time;
730 end_t = (motion_trail_frame_end._time - minimum_time) / delta_time;
740 vertex_segment_index = 0;
741 total_vertex_segments = total_vertices - 1;
743 if (_calculate_relative_matrix) {
744 start_transform.multiply (motion_trail_frame_start._transform, inverse_matrix);
745 end_transform.multiply (motion_trail_frame_end._transform, inverse_matrix);
748 start_transform = motion_trail_frame_start._transform;
749 end_transform = motion_trail_frame_end._transform;
752 motion_trail_vertex_start = &_vertex_array [0];
754 v0 = start_transform.xform (motion_trail_vertex_start -> _vertex);
755 v2 = end_transform.xform (motion_trail_vertex_start -> _vertex);
757 vertex_start_color = motion_trail_vertex_start -> _end_color + (motion_trail_vertex_start -> _start_color - motion_trail_vertex_start -> _end_color);
758 color_start_t = color_scale * start_t;
759 color_end_t = color_scale * end_t;
760 c0 = vertex_start_color * color_start_t;
761 c2 = vertex_start_color * color_end_t;
763 t0.set (st, motion_trail_vertex_start -> _v);
764 t2.set (et, motion_trail_vertex_start -> _v);
766 while (vertex_segment_index < total_vertex_segments) {
768 motion_trail_vertex_start = &_vertex_array [vertex_segment_index];
769 motion_trail_vertex_end = &_vertex_array [vertex_segment_index + 1];
771 v1 = start_transform.xform (motion_trail_vertex_end -> _vertex);
772 v3 = end_transform.xform (motion_trail_vertex_end -> _vertex);
775 vertex_end_color = motion_trail_vertex_end -> _end_color + (motion_trail_vertex_end -> _start_color - motion_trail_vertex_end -> _end_color);
777 c1 = vertex_end_color * color_start_t;
778 c3 = vertex_end_color * color_end_t;
781 t1.set (st, motion_trail_vertex_end -> _v);
782 t3.set (et, motion_trail_vertex_end -> _v);
784 this ->
add_geometry_quad (v0, v1, v2, v3, c0, c1, c2, c3, t0, t1, t2, t3);
796 vertex_segment_index += 1;
804 this -> end_geometry ( );
806 delete[] _vertex_array;
807 _vertex_array =
nullptr;
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
void reset()
Reset the frame sample history.
void update_motion_trail(PN_stdfloat current_time, LMatrix4 *transform)
See class header comments.
int check_for_update(PN_stdfloat current_time)
Check if a sample can be submitted.
~CMotionTrail()
Destructor.
void enable(bool enable)
Enable/disable the motion trail.
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 reset_vertex_list()
Reset the vertex list.
void set_geom_node(GeomNode *geom_node)
Set the GeomNode.
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_vertex(LVector4 *vertex, LVector4 *start_color, LVector4 *end_color, PN_stdfloat v)
Add a vertex.
CMotionTrail()
Constructor.
A node that holds Geom objects, renderable pieces of geometry.
Defines a series of disconnected triangles.
This defines the actual numeric vertex data stored in a Geom, in the structure defined by a particula...
This object provides a high-level interface for quickly writing a sequence of numeric values from a v...
void clear()
Resets the GeomVertexWriter to the initial state.
void add_data4(PN_stdfloat x, PN_stdfloat y, PN_stdfloat z, PN_stdfloat w)
Sets the write row to a particular 4-component value, and advances the write row.
void add_data2(PN_stdfloat x, PN_stdfloat y)
Sets the write row to a particular 2-component value, and advances the write row.
void add_data3(PN_stdfloat x, PN_stdfloat y, PN_stdfloat z)
Sets the write row to a particular 3-component value, and advances the write row.
A container for geometry primitives.
This class is an abstraction for evaluating NURBS curves.
The result of a NurbsCurveEvaluator.
This represents a unique collection of RenderAttrib objects that correspond to a particular renderabl...
TypeHandle is the identifier used to differentiate C++ class types.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.