I am trying to multiply some pigments together and then apply them to a 
heightfield. However the render is blank. Compare pigment_5 (average) 
with pigment_6 (multiply). The latter is blank the former is not.

What am I doing wrong?

Render as a square image using this image as input:

https://en.wikipedia.org/wiki/File:Heightmap.png

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On 5/13/2021 6:30 PM, Mike Horvath wrote:
> I am trying to multiply some pigments together and then apply them to a 
> heightfield. However the render is blank. Compare pigment_5 (average) 
> with pigment_6 (multiply). The latter is blank the former is not.
> 
> What am I doing wrong?
> 
> Render as a square image using this image as input:
> 
> https://en.wikipedia.org/wiki/File:Heightmap.png


The problem seems to be the slope pattern. It does not work when used in 
this manner. Other patterns are okay.


Mike

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Mike Horvath <mik### [at] gmailcom> wrote:

> The problem seems to be the slope pattern. It does not work when used in
> this manner. Other patterns are okay.

Right, the slope pattern needs something to operate ON.  Otherwise what value
should the slope have?  The slope of WHAT?

http://news.povray.org/povray.advanced-users/thread/%3Cweb.5e9285d148d892ebfb0b41570%40news.povray.org%3E/


So, I think you're going to have to do it another way.
2 stage render?   1st using slope, then 2nd using that first render as an image
map?

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On 5/13/2021 8:37 PM, Bald Eagle wrote:
> So, I think you're going to have to do it another way.
> 2 stage render?   1st using slope, then 2nd using that first render as an image
> map?
> 
> 

Yes, thanks.


Mike

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