1. Create a copy of the object in the 3D package. 'Push' the object, which means scale all the vertices relative to their normals. Flip the normals of the object (ie make all the faces point inwards), and then apply a black texture to them. Re-attach the mesh to the original mesh.
2. Use a second texture layer, set as 'multiply' with the environment map flag. Use a texture that has the top-half white and the bottom half grey/black/blue or whatever you want the shadow to be. This, however, will always draw the lighting from one direction, so it might look odd if you rotate the camera often.
Best of luck :)
2. Use a second texture layer, set as 'multiply' with the environment map flag. Use a texture that has the top-half white and the bottom half grey/black/blue or whatever you want the shadow to be. This, however, will always draw the lighting from one direction, so it might look odd if you rotate the camera often.
Best of luck :)