okay so. my plan is to add a normal map and texture to a low poly mesh. the normal map should be a combination of the high poly model and a texture. they should be baked together. I know you can bake them separately but that's not what I need. I need them together. could you please help? I think I figured it out but the mesh cant connect to itself or everything is messed up. ex) it will work on a plane but not on a cube. please help and thank you for doing so. :)
See How does normal baking work? on how normal maps are created.
You can't bake other textures and the normal into a normal map because the normal map encodes the direction of the normals in the RGB channels of the image representing the map.
From Bump_and_Normal (Linked to 2.4 because there is more info)
Normal maps in Blender store a normal as follows:
- Red maps from (0-255) to X (-1.0 - 1.0)
- Green maps from (0-255) to Y (-1.0 - 1.0)
- Blue maps from (0-255) to Z (0.0 - 1.0)
Since can add more than one texture to a model this isn't a restriction.
EDIT: A normal vector is perpendicular to a face its coordinates (x,y,z) are stored as a pixel in an image map.
You will have to convert your color map to a normal map and then assigning 2 normal maps in your texture slots. Then you will have to create a new image and bake the normals (not from multires). This way you have your 2 normal maps combined in 1.