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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) Blender Foundation
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Lukas Toenne
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenkernel/intern/particle_child.c
* \ingroup bke
*/
#include "BLI_math.h"
#include "DNA_material_types.h"
#include "BKE_particle.h"
struct Material;
extern void do_child_modifiers(ParticleSimulationData *sim, ParticleTexture *ptex, ParticleKey *par, float *par_rot, ChildParticle *cpa, const float orco[3], float mat[4][4], ParticleKey *state, float t);
static void get_strand_normal(Material *ma, const float surfnor[3], float surfdist, float nor[3])
{
float cross[3], nstrand[3], vnor[3], blend;
if (!((ma->mode & MA_STR_SURFDIFF) || (ma->strand_surfnor > 0.0f)))
return;
if (ma->mode & MA_STR_SURFDIFF) {
cross_v3_v3v3(cross, surfnor, nor);
cross_v3_v3v3(nstrand, nor, cross);
blend = dot_v3v3(nstrand, surfnor);
CLAMP(blend, 0.0f, 1.0f);
interp_v3_v3v3(vnor, nstrand, surfnor, blend);
normalize_v3(vnor);
}
else {
copy_v3_v3(vnor, nor);
}
if (ma->strand_surfnor > 0.0f) {
if (ma->strand_surfnor > surfdist) {
blend = (ma->strand_surfnor - surfdist) / ma->strand_surfnor;
interp_v3_v3v3(vnor, vnor, surfnor, blend);
normalize_v3(vnor);
}
}
copy_v3_v3(nor, vnor);
}
/* ------------------------------------------------------------------------- */
typedef struct ParticlePathIterator {
ParticleCacheKey *key;
int index;
float time;
ParticleCacheKey *parent_key;
float parent_rotation[4];
} ParticlePathIterator;
static void psys_path_iter_get(ParticlePathIterator *iter, ParticleCacheKey *keys, int totkeys, ParticleCacheKey *parent, int index)
{
BLI_assert(index >= 0 && index < totkeys);
iter->key = keys + index;
iter->index = index;
iter->time = (float)index / (float)(totkeys - 1);
if (parent) {
iter->parent_key = parent + index;
if (index > 0)
mul_qt_qtqt(iter->parent_rotation, iter->parent_key->rot, parent->rot);
else
copy_qt_qt(iter->parent_rotation, parent->rot);
}
else {
iter->parent_key = NULL;
unit_qt(iter->parent_rotation);
}
}
typedef struct ParticlePathModifier {
struct ParticlePathModifier *next, *prev;
void (*apply)(ParticleCacheKey *keys, int totkeys, ParticleCacheKey *parent_keys);
} ParticlePathModifier;
/* ------------------------------------------------------------------------- */
static bool check_path_length(int k, ParticleCacheKey *keys, ParticleCacheKey *key, float max_length, float step_length, float *cur_length, float dvec[3])
{
if (*cur_length + step_length > max_length) {
sub_v3_v3v3(dvec, key->co, (key-1)->co);
mul_v3_fl(dvec, (max_length - *cur_length) / step_length);
add_v3_v3v3(key->co, (key-1)->co, dvec);
keys->steps = k;
/* something over the maximum step value */
return false;
}
else {
*cur_length += step_length;
return true;
}
}
void psys_apply_child_modifiers(ParticleThreadContext *ctx, struct ListBase *modifiers,
ChildParticle *cpa, ParticleTexture *ptex, const float orco[3], const float ornor[3], float hairmat[4][4],
ParticleCacheKey *keys, ParticleCacheKey *parent_keys)
{
struct ParticleSettings *part = ctx->sim.psys->part;
struct Material *ma = ctx->ma;
const bool draw_col_ma = (part->draw_col == PART_DRAW_COL_MAT);
const int totkeys = ctx->steps + 1;
const float step_length = 1.0f / (float)ctx->steps;
const float max_length = ptex->length;
ParticlePathModifier *mod;
ParticleCacheKey *key;
int k;
float cur_length;
#if 0 /* TODO for the future: use true particle modifiers that work on the whole curve */
for (mod = modifiers->first; mod; mod = mod->next) {
mod->apply(keys, totkeys, parent_keys);
}
#else
(void)modifiers;
(void)mod;
{
ParticlePathIterator iter;
for (k = 0, key = keys; k < totkeys; k++, key++) {
psys_path_iter_get(&iter, keys, totkeys, parent_keys, k);
/* apply different deformations to the child path */
do_child_modifiers(&ctx->sim, ptex, (ParticleKey *)iter.parent_key, iter.parent_rotation, cpa, orco, hairmat, (ParticleKey *)key, iter.time);
}
}
#endif
cur_length = 0.0f;
/* we have to correct velocity because of kink & clump */
for (k = 0, key = keys; k < totkeys; ++k, ++key) {
if (k >= 2) {
sub_v3_v3v3((key-1)->vel, key->co, (key-2)->co);
mul_v3_fl((key-1)->vel, 0.5);
if (ma && draw_col_ma)
get_strand_normal(ma, ornor, cur_length, (key-1)->vel);
}
else if (k == totkeys-1) {
/* last key */
sub_v3_v3v3(key->vel, key->co, (key-1)->co);
}
if (k > 1) {
float dvec[3];
/* check if path needs to be cut before actual end of data points */
if (!check_path_length(k, keys, key, max_length, step_length, &cur_length, dvec))
break;
}
if (ma && draw_col_ma) {
copy_v3_v3(key->col, &ma->r);
get_strand_normal(ma, ornor, cur_length, key->vel);
}
}
}
|
