I have made a low-poly mesh in cycles, then duplicated it and sculpted more details onto it, and followed a tutorial that I had used before to try to bake the details, but all I got was a blank blue texture. i don't understand what I'm doing wrong. I added the normal map in the objects node editor, the two models are in the same place, and selected to active is checked. Please help! Here is the blend file:
A few little problems, easy enough to fix.
- Your low poly mesh needs to be UV unwrapped.
- Your ray distance needs to be increased a little bit to capture the details, somewhere around .2 to .3 worked for me depending on whether flat or smooth shading was enabled in the high poly mesh.
- For some reason your low poly mesh has two materials, that might be a bit confusing depending on how you're trying to use the normal map?
- Your high poly mesh appears to have flat shading enabled at least in parts (e.g. the face area), I don't know if that's what you wanted but the flatness/smoothness of the high poly mesh will get baked to the normal map.
Your bake is failing because your low poly mesh is not unwrapped. You need to create a UV map for your low poly mesh so that Blender knows how to map a point on the surface of your 3D mesh onto the 2D texture.