koobas.hobune.stream
Vertex and Fragment Shader worldNormal
How to access/calculate worldNormal in a Vertex and Fragment shader ?
Best Answer
Since the normal is in object coordinates when received from the vertices in the mesh, you need to transform it to world space. This is done by multiplying it with the object's model matrix. This matrix is called "_Object2World" in shaders, e.g.:
worldNormal = mul(_Object2World, objectNormal);
Thanks you ! FOr the moment I do: o.WorldNormal = normalize( mul(float4(v.normal, 0.0), _Object2World).xyz);
Oh, right, I forgot that _Object2World is a 4x4 matrix, so you gotta pad your vectors with a fourth coordinate w = 0, exactly like you're doing. Great!
