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render background image in arnold

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Hi crowd,

Using Arnold in Houdini 14 right now, I want to render a particle simulation with a background image in the beauty but not in the alpha and i cant get it. Someone can help me to archive this?




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i assume you need it to be a bg image and not an image on grid constrained to camera ... you could unselect all the checkboxes on the arnold properties tab except 'visible to camera rays' ...


but there might be a better way to do it with the bg as well.

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