Thanks for the code!
And for the position math I didn't need Superpatch. But I have used
Superpatch to deform a sphere with a heightfield of- Mars, Venus, Earth,
an asteroid etc. The trace function helps to place the camera on the
surface of these irregular objects. With some of the better heightfield
files of Earth, I should be able to "float down" from orbit and land in
a river valley with just one model of the Earth.

Again, thanks for your help.
Mr. Art

Uwe Zimmermann wrote:
> 
> > // yes, the trace function from Superpatch. testobject: first a sphere,
> > then the world!
> 
> You don't need Superpatch at all!
>

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