52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#include "private.h"
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#include <assert.h>
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#include <math.h>
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/*
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* Get the base presence factor of a layer, not accounting for other layers.
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*/
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double texturesGetLayerBasePresence(TexturesLayerDefinition* layer, TerrainResult terrain)
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{
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return zoneGetValue(layer->terrain_zone, terrain.location, terrain.normal);
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}
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/*
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* Get triplanar noise value, depending on the normal direction.
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*/
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double texturesGetTriplanarNoise(NoiseGenerator* noise, Vector3 location, Vector3 normal)
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{
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/*assert(v3Norm(normal) == 1.0);*/
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double noiseXY = noiseGet2DTotal(noise, location.x, location.y);
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double noiseXZ = noiseGet2DTotal(noise, location.x, location.z);
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double noiseYZ = noiseGet2DTotal(noise, location.y, location.z);
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double mXY = fabs(normal.z);
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double mXZ = fabs(normal.y);
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double mYZ = fabs(normal.x);
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double total = mXY + mXZ + mYZ;
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mXY /= total;
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mXZ /= total;
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mYZ /= total;
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return noiseXY * mXY + noiseXZ * mXZ + noiseYZ * mYZ;
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}
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double texturesGetMaximalDisplacement(TexturesDefinition* textures)
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{
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int i, n;
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double disp = 0.0;
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n = layersCount(textures->layers);
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for (i = 0; i < n; i++)
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{
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TexturesLayerDefinition* layer = layersGetLayer(textures->layers, i);
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if (layer->displacement_height > 0.0)
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{
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disp += layer->displacement_height;
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}
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}
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return disp;
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}
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