I’ve followed Andrew Price’s tutorial on Camera tracking and managed to finish my experiment with expected results. This was done with the internal render engine:
Now I want to use the Cycles Render, so I removed the car model, inserted a standard “suzanne”, applied a blue diffuse shader and tried to render. Initially I didn’t see anything, but that was due to the film setting not having the ‘transparent’ option clicked. DId that, and then tried again. Result is here. In the first couple of passes in the render I see it renders suzanne ok with the right colors, but at the end in the composition colors disappear, leaving just some transparent form:
here are the nodes:
I’ve followed another tutorial from blender itself (track, match: 20) on youtube, but this seemed to work straight of the box correctly. That was using v. 2.62, I’m now on Ubuntu with standard blender version 2.66.
Am I missing a step in the materials? I read somewhere about needing to use “holdout” materials. Are those necessary and if so, how do you set those up?