Re: What is the standard material conversion ?

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Shankar Swamy (shankar++at++redwood.rt.cs.boeing.com)
Tue, 23 Sep 1997 11:07:41 -0700

On Sep 23, 4:33pm, ceti wrote:
>
> Typically, all inventor's parameters are in a range of 0.0 to 1.0.
> OpenGL are in range of -1.0 to 1.0 or 0 to 128
>
> Is the transformation I'm assuming correct ?
>
> Ambient OGL= ( 2* Ambient Oiv ) - 1
> Difuse OGL= ( 2* Difuse Oiv ) - 1
> Specular OGL= ( 2* Specular Oiv ) - 1
> emis OGL= ( 2* emis Oiv ) - 1
> shininess OGL= 128* shininess OIV
> transparency OIV converted [( 2*transparency OIV )-1] and reported in Alpha
> component of material definition
>

OpenGL lighting from Open Inventor lighting:

Diffuse, specular and ambient values map directly.

OpenGL specular exponent = 128.0f*shininess
OpenGL alpha = (1.0f - transparency)

 - shankar swamy
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