The case of the disappearing particles

Arnold Support Corner

In this case, nParticles (render type = point) weren’t visible behind a refractive plane:
particles_not_visible

For the points render type, you get an Arnold points shape (with mode “disk”), so I exported an ASS file to see the parameter settings on the points node. I noticed the visibility 243 right away (the default visibility is 255, which is visible to all rays). And sure enough, in the Render Stats for the particle shape, some rays were turned off (and the check boxes were disabled too).
particles_render_stats

I used the User Options to force the visibility to 255
particles_useroptions
and the particles behind the refractive surface appeared:
particles_visible

This is a Maya thing. For most particle render types, the particles are not visible in reflections or refractions. It says so in the docs:

You can turn on reflections, refractions, and shadows when you software render Clouds, Tubes, and Blobby Surfaces

I’m not…

View original post 116 more words

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~ by Cylibral on February 28, 2015.

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