 | | | Paint F/X and objects with transparency....?? | Paint F/X and objects with transparency....?? 2003-12-01 - By Duncan Brinsmead
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When there is no or little alpha it is not necessarily incorrect. Some
objects are fully transparent, and yet add color to the scene. In the case
of rain the drops are clear.. it is the specular and reflected component
that adds color to the image. ( if you make a sphere fully transparent then
stick a reflection map on it it will not show up in the alpha channel ).In
these cases you can render against black then composite with an additive
composite.. no alpha and thus no need to block what is behind, we simply add
in some more light. It gets trickier when you have a mixture of incandescent
or glowing transparent objects and opaque objects with antialiased alpha
mattes ... sometimes you may need multiple compositing layers.
Paint effects currently cannot be partially occluded by normal geometry.
Using the depthType on the camera you can set a transparency threshold at
which paint effects becomes occluded, but below that threshold it will
appear in front of transparent objects.
One option you might look at is paint effects to poly.
Duncan
-- --Original Message-- --
From: maya-bounce@(protected) [mailto:maya-bounce@(protected)]On
Behalf Of Zach Prichard
Sent: Monday, December 01, 2003 5:00 AM
To: maya@(protected)
Subject: Paint F/X and objects with transparency....??
I'm having a problem with Paint F/X showing up OVER objects with
transparencies on them...
aka I'm rendering a window with transparency and in the background are some
paint f/x strokes...they render as if
they were in FRONT of the damn window.
Now I know that this is b/c they are applied in post-rendering and I know
the first solution is to comp them...
but the window pain has raindrops on it that I CAN'T render seperately
(which is another issue...I'm using a very transparent water
texture on blobby surface particles..and in the scene the transparency works
great..but if I render the particles by themselves and
check the alpha they have no transparency at all...wtf?).
So is there a way to get paint F/X to obey the transparency laws?
z
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