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BLI_rand: add a function returning a random point whithin given 2D triangle. 

Needed by transfer data.
This commit is contained in:
Bastien Montagne 2015-01-09 11:54:51 +01:00
parent 88ee44a9ac
commit 2e72d756c4
2 changed files with 28 additions and 0 deletions
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3
source/blender/blenlib/BLI_rand.h
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@ -55,6 +55,9 @@ double BLI_rng_get_double(struct RNG *rng) ATTR_WARN_UNUSED_RESULT ATTR_NON
float BLI_rng_get_float(struct RNG *rng) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
void BLI_rng_get_float_unit_v2(struct RNG *rng, float v[2]) ATTR_NONNULL(1, 2);
void BLI_rng_get_float_unit_v3(struct RNG *rng, float v[3]) ATTR_NONNULL(1, 2);
void BLI_rng_get_tri_sample_float_v2(
struct RNG *rng, const float v1[2], const float v2[2], const float v3[2],
float r_pt[2]) ATTR_NONNULL();
void BLI_rng_shuffle_array(struct RNG *rng, void *data, unsigned int elem_size_i, unsigned int elem_tot) ATTR_NONNULL(1, 2);
/** Note that skipping is as slow as generating n numbers! */

25
source/blender/blenlib/intern/rand.c
View File

@ -144,6 +144,31 @@ void BLI_rng_get_float_unit_v3(RNG *rng, float v[3])
}
}
/**
* Generate a random point inside given tri.
*/
void BLI_rng_get_tri_sample_float_v2(
RNG *rng, const float v1[2], const float v2[2], const float v3[2],
float r_pt[2])
{
float u = BLI_rng_get_float(rng);
float v = BLI_rng_get_float(rng);
float side_u[2], side_v[2];
if ((u + v) > 1.0f) {
u = 1.0f - u;
v = 1.0f - v;
}
sub_v2_v2v2(side_u, v2, v1);
sub_v2_v2v2(side_v, v3, v1);
copy_v2_v2(r_pt, v1);
madd_v2_v2fl(r_pt, side_u, u);
madd_v2_v2fl(r_pt, side_v, v);
}
void BLI_rng_shuffle_array(RNG *rng, void *data, unsigned int elem_size_i, unsigned int elem_tot)
{
const size_t elem_size = (unsigned int)elem_size_i;