Question

I'm trying to rewrite a shader I have in OpenGL that does:

vec3 somevariable = mat3*vec3;

mat3 and vec3 would be two variables of that type, however when i tried do:

float3x3 * float3

I get error in HLSL which is fine but when I try convert the math to: (where ca = mat3 and no would be the vec3) (float3x3 float3)

float3 somevariable = float3(ca[0].x*no.x+ca[0].y*no.y+ca[0].z*no.z,ca[1].x*no.x+ca[1].y*no.y+ca[1].z*no.z,ca[2].x*no.x+ca[2].y*no.y+ca[2].z*no.z);

This gives a different output than mat3*vec3 does in OpenGL, anyone know why? thanks :3

Answer 1

就矩阵是行主要还是列主要而言，GLSL和HLSL之间似乎存在差异。

如果没有看到错误，我会假设你的尺寸不匹配。您需要将矢量定义为float1x3或交换矢量和矩阵：