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The attached scene is the planes overlapping with a difference of 0.0002 in the z-axis. The Plane on the Right has a Refraction material.
(The difference in Z-axis cannot be seen unless Spinner's Precision is set to 4 decimals in 3dsMax's Preference Settings.)
Overlaps look correct in V-Ray CPU Render.
But the V-Ray GPU makes the overlap black.
V-Ray GPU doesn't seem to calculate secondary rays bias precision with 4 decimal places.
Can't the GPU render with the same precision as the CPU?
We used 3dsMax's V-Ray GPU here, but it was our V-Ray for Houdini users who pointed this issue out.
Houdini defaults to meters and users sometimes use fractional millimeters. In other words, the distance may be specified with 0.0001m.
In Houdini, changing the base unit affects various parts, so it is difficult to change.
Confirmed with V-Ray 6, hotfix 3 +3dsMax 2023
(The difference in Z-axis cannot be seen unless Spinner's Precision is set to 4 decimals in 3dsMax's Preference Settings.)
Overlaps look correct in V-Ray CPU Render.
But the V-Ray GPU makes the overlap black.
V-Ray GPU doesn't seem to calculate secondary rays bias precision with 4 decimal places.
Can't the GPU render with the same precision as the CPU?
We used 3dsMax's V-Ray GPU here, but it was our V-Ray for Houdini users who pointed this issue out.
Houdini defaults to meters and users sometimes use fractional millimeters. In other words, the distance may be specified with 0.0001m.
In Houdini, changing the base unit affects various parts, so it is difficult to change.
Confirmed with V-Ray 6, hotfix 3 +3dsMax 2023
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