#Opacity map not Transp.
8 messages in this thread
I'm having some trouble using a opacity map to cut out a flat object, it seems
that pure RGB black isn't 100% transparent.. is this a "feature" or an error
on my part? I'm using an RGB TGA file for the grayscale transparency map,
since I used this successfully before. (I know it doesn't make sense) I got
3DS cutting out shapes before (after many test renders, file formats, etc.)
but it's not working now. The maps are high rez (~1k), and are used to cast
raytraced shadows.. I have several maps to do, and it'd take too long to
recreate them in a vector program, but I would prefer a mesh over opacity
raytracing. Any info would be appreciated.
JNJ
John,
Can you see part of the object, or is the light not penetrating
correctly? If it's the first, make sure you've copied the opacity map to the
shininess slot, perhaps as a negative mask, depending…
Paul S.
Paul,
The main part is showing correctly (a logo), but there is a transparent (red)
area that should be cut out with the map. This highly transparent area
continues all through the flat object, revealing that it's mapped on a
rectangle. (spoils the effect. <g>)
I'll play with the shineness spot, but one regular map and one for the opacity
is all I've needed before.
Thanks for the quick reply. 🙂
JNJ
Hi John,
<< not quite transparent..>>
What's you file input gamma set to? You may be shifting 0,0,0 up..
Hi Jonas,
>What's you file input gamma set to? You may be shifting 0,0,0 up..<
will check. What should it be? <g>
JNJ
Jonas,
>What's you file input gamma set to? You may be shifting 0,0,0 up..
It's set to 1.8
JNJ
Hi John,
<< 1.8 for input file gamma..>>
Reread the advanced user guide on Gamma. Try changing file input gamma to 1.0
and rerender. Post your results..
jonas[adesk]
Jonas,
>Reread the advanced user guide on Gamma. Try changing file input gamma to 1.0
and rerender. <
I ended getting it working using black for the map areas being cut out (instead
of red and blue, which they were before) The transparency isn't noticable
then. I'll re-read, and try the 1.0 gamma monday, and get back with you on how
that works (with a colored map in the cut out areas) That's probably it. (I
forgot about the effects of gamma on a opacity map.)
Thanks,
JNJ