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Recompute Y from X/Z for normal maps

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Atlante45 2017-05-02 17:07:50 -07:00
parent 7cb2bff4c5
commit ea2b188b64
1 changed files with 3 additions and 1 deletions
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4
libraries/render-utils/src/MaterialTextures.slh
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@ -64,7 +64,9 @@ float fetchRoughnessMap(vec2 uv) {
uniform sampler2D normalMap; uniform sampler2D normalMap;
vec3 fetchNormalMap(vec2 uv) { vec3 fetchNormalMap(vec2 uv) {
// unpack normal, swizzle to get into hifi tangent space with Y axis pointing out // unpack normal, swizzle to get into hifi tangent space with Y axis pointing out
return normalize(texture(normalMap, uv).rbg -vec3(0.5, 0.5, 0.5)); vec2 t = 2.0 * (texture(normalMap, uv).rg - vec2(0.5, 0.5));
vec2 t2 = t*t;
return normalize(vec3(t.x, sqrt(1 - t2.x - t2.y), t.y));
} }
<@endif@> <@endif@>