Dispersion Abbe shining blue (even with zero light)

[pacox21]

Hello,

I'm facing a weird behavior with a glass material with dispersion abbe : the material keeps shining blue, even with no lights in the scene.

It does not happen if I have a fully modeled environment (it still emits blue in the dark but with the lights on it's gone), only on alpha backgrounds where the blue keeps showing in corners of the material.

Is this normal ?

C4DtoA 4.0.2 S25 on Mac

Thanks

Francis

[pacox21]

Hello

Small update : it only happens when the "transmit AOV" option is checked.

Francis

[alan.kingFCDLA]

I can reproduce this issue, thanks for the report. The beauty pass with any non-zero Abbe setting and transmit_aovs turned on renders blue as long as the background has no shader assigned to it.

Tracking this issue in the core as ARNOLD-12159

I found that the blue color comes from the "error_color_bad_pixel" render option, which is a replacement color that is used by arnold to indicate a non-representable color or opacity value. Setting "error_color_bad_pixel" to black may be viable as a workaround for now until this bug is fixed.

[lee_griggs]

error_color_bad_pixel can be found under the Diagnostics tab in the Render Settings.

https://docs.arnoldrenderer.com/display/A5AFCUG/Error+Handling

[pacox21]

Thank you guys !