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Request : Switch to disable dispersion globally
Posted: Wed Aug 24, 2011 7:58 pm
by galinette
When developing scenes with different glass materials that have dispersion, it would be nice to have a switch in the indigo GUI for disabling it. Dispersion makes render times significantly increased, and makes fast previewing and camera movement less comfortable.
The switch would force all cauchy_b to zero, and better, would also compensate the base IOR so that the refractive index at an average wavelength (such as 500nm) does not change
Etienne
Re: Request : Switch to disable dispersion globally
Posted: Wed Aug 24, 2011 11:13 pm
by Headroom
+1
Re: Request : Switch to disable dispersion globally
Posted: Fri Aug 26, 2011 10:15 pm
by dcm
galinette wrote:When developing scenes with different glass materials that have dispersion, it would be nice to have a switch in the indigo GUI for disabling it. Dispersion makes render times significantly increased, and makes fast previewing and camera movement less comfortable.
The switch would force all cauchy_b to zero, and better, would also compensate the base IOR so that the refractive index at an average wavelength (such as 500nm) does not change
Etienne
i think its more exporter issue, or not ?
Re: Request : Switch to disable dispersion globally
Posted: Sat Aug 27, 2011 9:04 am
by saint-gobain-glass
It cannot be an exporter feature, as this would not work with linked igms (All my glass materials have tabulated data and are not supported by exporters, so they need to be externally linked)
Also, disabling dispersion for previewing, may imply re-enabling it for the final render, and this would be best done without re-exporting. Especially with Indigo 3, where interactivity was introduced, it's very useful to disable dispersion while moving camera. Requiring to re-export after the correct point of view is adjusted interactively would make interactivity useless.
Etienne