34 lines
965 B
C
34 lines
965 B
C
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#include "private.h"
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#include <assert.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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