Hi,

i have written a converter to convert from the stl-format to povray. The 
first version of this converter is now some years old, the last one is 
ready now written in java.

But i have some problems with rendering the scenes. In binary.images you 
can see two images, the one showing the result of the rendering, the 
other showing the calculated norm-vectors that really look as they 
should be for a smooth scene.

When gouraud-shading a 3d-scene there might be a error called 
mach-banding, but with phon-shading by interpolating the norm-vectors in 
stead of the shading-values this mach-banding should dissapear.

But you can see that some triangles are not calculated smooth. I can 
post the stl-file (shortened) and the java-prog for examination, perhaps 
it is my fault and i am not able to see it ...

The problems appear in all of my stl2pov-versions, not only in the new 
java-version ...


Hartmut Wagener

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