now i want to rewrite the glsl script to cg script,but it fail to work, the glsl script: uniform vec4 translation; uniform vec4 camera; uniform float timer; void main(void) { vec4 regularPosition = gl_Vertex; regularPosition.y += cos(timer*0.75); vec4 correctPosition = regularPosition + translation; gl_TexCoord[0] = gl_TextureMatrix[1] * correctPosition; gl_TexCoord[1] = gl_MultiTexCoord0*2.0; gl_TexCoord[2] = camera - correctPosition; gl_TexCoord[3] = correctPosition; gl_Position = gl_ModelViewProjectionMatrix*regularPosition; } here is the cg script i wrote: struct ApplicationVertex { float4 position: POSITION; float4 texCoord0: TEXCOORD0; }; struct VertexFragment { float4 color0: COLOR0; float4 texCoord0: TEXCOORD0; float4 position: POSITION; }; uniform float4x4 modelViewProjMatrix : state.matrix.mvp; uniform float4x4 textureMatrix : state.matrix.texture; void main(ApplicationVertex av, uniform float4 translation, uniform float4 camera, uniform float timer, out float4 color0: COLOR0, out float4 texCoord0: TEXCOORD0, out float4 texCoord1: TEXCOORD1, out float4 texCoord2: TEXCOORD2, out float4 texCoord3: TEXCOORD3, out float4 position: POSITION) { float4 regularPosition = av.position; regularPosition.y += cos(timer*0.75); float4 correctPosition = regularPosition + translation; texCoord0 = mul(textureMatrix,correctPosition); texCoord1 = av.texCoord0*2.0; texCoord2 = camera - correctPosition; texCoord3 = correctPosition; position = mul(modelViewProjMatrix, regularPosition); } i seems that i have't find correct matrix in cg accroding gl_TextureMatrix[1] in glsl , is uniform float4x4 textureMatrix : state.matrix.texture in cg right?