1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*************************************************************************/
/* velocity_tracker_3d.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "velocity_tracker_3d.h"
void VelocityTracker3D::set_track_physics_step(bool p_track_physics_step) {
physics_step = p_track_physics_step;
}
bool VelocityTracker3D::is_tracking_physics_step() const {
return physics_step;
}
void VelocityTracker3D::update_position(const Vector3 &p_position) {
PositionHistory ph;
ph.position = p_position;
if (physics_step) {
ph.frame = Engine::get_singleton()->get_physics_frames();
} else {
ph.frame = Engine::get_singleton()->get_frame_ticks();
}
if (position_history_len == 0 || position_history[0].frame != ph.frame) { //in same frame, use latest
position_history_len = MIN(position_history.size(), position_history_len + 1);
for (int i = position_history_len - 1; i > 0; i--) {
position_history.write[i] = position_history[i - 1];
}
}
position_history.write[0] = ph;
}
Vector3 VelocityTracker3D::get_tracked_linear_velocity() const {
Vector3 linear_velocity;
double max_time = 1 / 5.0; //maximum time to interpolate a velocity
Vector3 distance_accum;
double time_accum = 0.0;
double base_time = 0.0;
if (position_history_len) {
if (physics_step) {
uint64_t base = Engine::get_singleton()->get_physics_frames();
base_time = double(base - position_history[0].frame) / Engine::get_singleton()->get_physics_ticks_per_second();
} else {
uint64_t base = Engine::get_singleton()->get_frame_ticks();
base_time = double(base - position_history[0].frame) / 1000000.0;
}
}
for (int i = 0; i < position_history_len - 1; i++) {
double delta = 0.0;
uint64_t diff = position_history[i].frame - position_history[i + 1].frame;
Vector3 distance = position_history[i].position - position_history[i + 1].position;
if (physics_step) {
delta = double(diff) / Engine::get_singleton()->get_physics_ticks_per_second();
} else {
delta = double(diff) / 1000000.0;
}
if (base_time + time_accum + delta > max_time) {
break;
}
distance_accum += distance;
time_accum += delta;
}
if (time_accum) {
linear_velocity = distance_accum / time_accum;
}
return linear_velocity;
}
void VelocityTracker3D::reset(const Vector3 &p_new_pos) {
PositionHistory ph;
ph.position = p_new_pos;
if (physics_step) {
ph.frame = Engine::get_singleton()->get_physics_frames();
} else {
ph.frame = Engine::get_singleton()->get_frame_ticks();
}
position_history.write[0] = ph;
position_history_len = 1;
}
void VelocityTracker3D::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_track_physics_step", "enable"), &VelocityTracker3D::set_track_physics_step);
ClassDB::bind_method(D_METHOD("is_tracking_physics_step"), &VelocityTracker3D::is_tracking_physics_step);
ClassDB::bind_method(D_METHOD("update_position", "position"), &VelocityTracker3D::update_position);
ClassDB::bind_method(D_METHOD("get_tracked_linear_velocity"), &VelocityTracker3D::get_tracked_linear_velocity);
ClassDB::bind_method(D_METHOD("reset", "position"), &VelocityTracker3D::reset);
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "track_physics_step"), "set_track_physics_step", "is_tracking_physics_step");
}
VelocityTracker3D::VelocityTracker3D() {
position_history.resize(4); // should be configurable
}
|