[REQ] hdr environment - gamma control
[REQ] hdr environment - gamma control
It is a common method to adjust the gamma of a HDR environment map to achieve more/less contrast output from the environment.
In some cases this is required to achieve the intended/desired effect from the hdr source.
If possible saturation control for the HDR would also be very useful.
In some cases this is required to achieve the intended/desired effect from the hdr source.
If possible saturation control for the HDR would also be very useful.
Re: [REQ] hdr environment - gamma control
Gamma is adjustable using the texture exponent wich is hopefully exposed someplace.
obsolete asset
Re: [REQ] hdr environment - gamma control
Gain exponent is there, is this what you meant? It just appears to change brightness/gain.
Re: [REQ] hdr environment - gamma control
Sorry I'm not used with the blender terminology, I would not like to add to the confusion.
In Indigo terms, every texture has properties among wich exponent. Exponent is normally the inverse function of gamma, though it may behave just like gamma in our case.
The question is: where can you access the HDR texture's exponent parameter within blendigo.
For some reason the Gamma control within Indigo GUI's texture editor is greyed out (in the material test scene).
In Indigo terms, every texture has properties among wich exponent. Exponent is normally the inverse function of gamma, though it may behave just like gamma in our case.
The question is: where can you access the HDR texture's exponent parameter within blendigo.
For some reason the Gamma control within Indigo GUI's texture editor is greyed out (in the material test scene).
obsolete asset
Re: [REQ] hdr environment - gamma control
In Indigo, select the 'Background Settings'' and see the texture editor for Emission.
obsolete asset
Re: [REQ] hdr environment - gamma control
Here is the settings for the environment lamp on blender. It just behaves like gain/power.
And yes, the gamma in indigo texture setting is greyed out.Re: [REQ] hdr environment - gamma control
Well. In one case it's not exposed and in the other it is greyed out. Last option might be to edit the IGS file after export and before it is loaded.
obsolete asset
Re: [REQ] hdr environment - gamma control
Gamma has to be one for HDR images in Indigo. You could use the 'a' texture param though (quadratic coefficient)
Re: [REQ] hdr environment - gamma control
I always thought that tweaking the environment map gamma would allow to cheat with low dynamic ranges.OnoSendai wrote:Gamma has to be one for HDR images in Indigo.
Bummer why did I never use it ?OnoSendai wrote:You could use the 'a' texture param though (quadratic coefficient)
obsolete asset
Re: [REQ] hdr environment - gamma control
Interesting, do you plane to expose this in exporters?
Re: [REQ] hdr environment - gamma control
The A, B and C parameters should be available in all Exporters to tweak the texture since quite some timeWilliam wrote:Interesting, do you plane to expose this in exporters?
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Re: [REQ] hdr environment - gamma control
Does not appear available for environment texture in blender (see screenshot of setting above)
Re: [REQ] hdr environment - gamma control
Ah ok, got itWilliam wrote:Does not appear available for environment texture in blender (see screenshot of setting above)
Blendigo doesn't use a Material for EnvMap but a direct link to a texture instead. That is different in C4D exporter for example...
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- Polinalkrimizei
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- Joined: Sat May 02, 2009 6:59 am
Re: [REQ] hdr environment - gamma control
And while we're at it: If "a" can control gamma in an hdr, why not call it gamma control?! Or at least something more intuitive...
And whatever "b" does, I think 99% of the artists use it to determine the height of the bump/displacement effect, so why not give it proper name? If you're new to Indigo, this function may seem reeeeaaaaallllly well hidden
And whatever "c" does... well, actually I don't even know. Forum search will help, but why so hard?
And whatever "b" does, I think 99% of the artists use it to determine the height of the bump/displacement effect, so why not give it proper name? If you're new to Indigo, this function may seem reeeeaaaaallllly well hidden
And whatever "c" does... well, actually I don't even know. Forum search will help, but why so hard?
Re: [REQ] hdr environment - gamma control
C does a upscale / clamp of all RGB values. With an C value of -0.5 for example you reduce the RGB of a texture by 128. That is nice to clamp values for bumpmaps or exponent maps, so areas of a texture move into full white or black and result in a hard cut contrast.Polinalkrimizei wrote:And whatever "c" does... well, actually I don't even know. Forum search will help, but why so hard?
You also can "flip" a texture by using a B of -1 and a C of 1. Useful for blend maps and others
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