[Radiance-general] Re: colorpict modifiers in instances and frozen

[Lars O. Grobe]

Hi!

Thank you for your help!

> Only if the colorpict pattern was included in the original file you
> used to create your octree instance.  If it is defined in a separate
> material file included with the scene containing the instance, the
> transformation will not be applied the same way.

I think I understand, while I still don't get this working. I have added some 
lines to my Makefile now that copy the lines defining the colorpict modifier 
into the geometry file of the instance instead of defining the colorpict 
modifier in my global materials file. So I have a objectname.rad.mat file for 
every object, which is included into the the file I get from dxf2rad. This 
file has a statement "void colorpict mypattern....", and a line "mypattern 
alias l_object mymaterial", with mymaterial defined in the global materials 
file. This should work...?

> You really should follow Schorsch's advice also about when to use the
> instance primitive.  There really needs to be a help file or something
> on instances, and I seem to remember writing something like this
> somewhere, but now I can't even find it...  The rule of thumb I use is
> that there have to be at least 200 geometric primitives in an object
> before it's worth making an instance.  Otherwise, the overhead of
> tracing rays through instanced octrees negates the memory savings.

Yes, I will do these "optimation" later... at the moment, I try the general 
concept of using instances, as most objects have quite complex geometries, or 
at least they will get more and more complicated.

> Replmarks replaces the markers with transformed scene files (or
> instances), and as long as you put the related colorpict's in the
> transformed scene files (or instances), and not in the replmarks input,
> you should be OK.

Now I'm really not sure anymore if I understood anything right... If I 
putanything (geometry and colorpict statement) into the instance, and place 
this instance in my scene with replmarks, the colorpict mapping will be 
transformed to the position of the instance!??? So, if I have an plane at 
0;0;0, with a mapping (using picture.cal, pic_u, pic_v) applied with 
colorpict without any transformation (which means it is at 0;0;0 on the 
plane), I than oconv this into an octree, and place this octree with 
replmarks into my scene, the plane with it's pattern will appear at the 
triangle markers positions, not only the transformed geometry without pattern?

Thank you,CU, Lars.


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