In article <B9744727.4BFF%gle### [at] isrvcom>,
 Glenn Greenway <gle### [at] isrvcom> wrote:

> Thank you for your comments.  However, I would like to evaluate a height
> field at parse time, not render time. 

The trace() function is a scene description language feature that 
operates at parse time, not render time.


> I've been trying to use bitmap data to add a deformation map feature 
> to a mesh creation macro i've been working on. I thought that the 3.5 
> function feature might be the way to go.  But i can't figger it.  
> With MegaPov hf_height_at() i could loop through and evaluate values 
> at each point before rendering.  Thanks again. 

You could do the exact same thing with the trace() function, see the 
manual. However, it sounds like functions are a better solution. You 
might want to look at the height field macros in shapes.inc for examples.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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