Differential D354 Diff 1117 source/blender/blenlib/intern/pe.c

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				#include "DNA_scene_types.h"

				#include "BLI_rand.h"
				#include "BLI_math.h"

				#include "BLI_pe.h"


				float BLI_pe_factor_distance(float dist, float maxdist, int falloff_type) {
				/* Originally from transform_generic.c's calculatePropRatio */

				dist = 1.0f - dist / maxdist;

				if (dist <= 0.0f)
				return 0.0f;

				if (dist > 1.0f)
				return 1.0f;

				switch (falloff_type) {
				case PROP_SHARP:
				return dist * dist;
				case PROP_SMOOTH:
				return 3.0f * dist * dist - 2.0f * dist * dist * dist;
				case PROP_ROOT:
				return (float)sqrt(dist);
				case PROP_LIN:
				return dist;
				case PROP_CONST:
				return 1.0f;
				case PROP_SPHERE:
				return (float)sqrt(2 * dist - dist * dist);
				case PROP_RANDOM:
				return BLI_frand() * dist;
				default:
				return 1.0f;
				}
				}

				void BLI_pe_compute_factors(int totvert, float in_dists, float out_factors,
				float falloff_distance, int falloff_type)
				{
				int a;
				for (a = 0; a < totvert; ++a) {
				out_factors[a] = BLI_pe_factor_distance(in_dists[a], falloff_distance, falloff_type);
				}
				}