There’s an Arnold error that recommends setting the load_at_init parameter, but people don’t always know where to find that in their favorite Arnold plugin.
The image_plane node is a shader, and if you were to check its code, you’d see that it handles camera rays only for any other ray type (like refraction), the image_plane shader returns black. In an ASS file, it looks like this: optionsĬolor c4d|Arnold_Shader_Network|checkerboard You won’t see it in Cinema 4D, but when C4DtoA translates the scene to Arnold, the background object is translated as a shader plugged into the options.background parameter (in Cinema 4D, this is the Environment > Background parameter in the Render Settings). The “background object” is actually a shader plugged into the Arnold background slot. The black areas are where the background object isn’t visible to refraction rays. Here’s an example: a refractive sphere in front of a torus, in front of the background checkerboard object. Or reflections, or anything but camera rays. The background object isn’t visible in refractions.
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