Re: IV-Loader and transparency

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Mark Lasersohn (laser++at++cowhouse.com)
Thu, 24 Jul 1997 17:46:28 -0400

Dirk Reiners wrote:
>
> Hi pfFolks,
>
> I have a problem using the IV-loader and transparent materials. Attached is a
> little file that illustrates the problem.
>
> It contains two objects, one of which (the red one) is transparent, the other
> (blue) one is opaque. Using ivview, that is. When using perfly both are
> transparent (remember to switch off antialiasing, otherwise multisample
> transparency using the same transparency value might hit you).
>
> Apparently for some reason the transparency value cannot be reset to 0 after it
> was set to another value. If I put the Cyl1 node before the Mat2 node
> everything works fine. But as I'm writing an export option for another biggish
> system I'd rather fix the import problem taht try to rearrange all my files.
>
> I'm using the libpfiv that was posted by Eric Chauvineau. Is there a later
> version or has anybody else encountered this problem and maybe fixed it?
>
> Thanks a lot
>
> Dirk
>
> --
> -- Dirk Reiners reiners++at++ecrc.de, reiners++at++igd.fhg.de
> -- ZGDV - AR Group http://www.igd.fhg.de/~reiners
> -- Arabellastr. 17 (ECRC)
> -- D-81925 Muenchen All standard disclaimers apply.
> -- Truth is stranger than fiction because fiction has to make sense.
>
> ---------------------------------------------------------------
-- 


	Yup, it works as you described (Crimson VGXT) running
Performer 2.0 - but I fixed it by using a explicit Material
statement, instead of referencing a material declared earlier.


#Inventor V2.0 ascii


DEF ROOT Separator {
        Coordinate3 { point [
                1.0000000000 0.0000000000 -1.0000000000, 
                -0.0000000437 1.0000000000 -1.0000000000, 
                -1.0000000000 -0.0000000874 -1.0000000000, 
                0.0000000119 -1.0000000000 -1.0000000000, 
                1.0000000000 0.0000000000 1.0000000000, 
                -0.0000000437 1.0000000000 1.0000000000, 
                -1.0000000000 -0.0000000874 1.0000000000, 
                0.0000000119 -1.0000000000 1.0000000000, 
        ] }        
        DEF Mat1 Material {
                        ambientColor 0.000 0.000 1.000
                        diffuseColor 0.000 0.000 1.000
                        specularColor 0.000 0.000 0.000
                        shininess 0.156
                        transparency 0.0
        }        
        DEF Cyl1 Separator {
                USE Mat1
                IndexedFaceSet { coordIndex [
                        3, 2, 1, 0, -1, 2, 3, 7, 
                        6, -1, 3, 0, 4, 7, -1, 1, 
                        2, 6, 5, -1, 0, 1, 5, 4, 
                        -1, 4, 5, 6, 7, -1, 
                ] }
        }        
        DEF Cyl2 Separator {
        	Material {
                	ambientColor 1.000 0.000 0.000
                       	diffuseColor 1.000 0.000 0.000
                        specularColor 0.000 0.000 0.000
                        shininess 0.156
                        transparency 0.5
        	}
                MatrixTransform {
                        matrix 1.00000 0.00000 0.00000 0.00000
                                   0.00000 0.00000 1.00000 0.00000
                                   0.00000 1.00000 0.00000 0.00000
                                   2.00000 0.00000 0.00000 1.00000
                }
                IndexedFaceSet { coordIndex [
                        3, 2, 1, 0, -1, 2, 3, 7, 
                        6, -1, 3, 0, 4, 7, -1, 1, 
                        2, 6, 5, -1, 0, 1, 5, 4, 
                        -1, 4, 5, 6, 7, -1, 
                ] }
        }
}




Mark Lasersohn
Cow House Productions
laser++at++cowhouse.com
http://www.cowhouse.com
330-569-7492
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