the tex2d in your loop causes the gradient error to be triggered. If you use tex2dlod, and fill in float4(pos1.x,pos1.y,0,0) for the texture argument, it will work . Found the solution here, also the only thread about it on the whole internet. In English at least. Shaders are SO completely undocumented.
. Found the solution here, also the only thread about it on the whole internet. In English at least. Shaders are SO completely undocumented.
