Fade-ins & Transparency 2004-02-08 - By Harvey White
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On Sun, 08 Feb 2004 17:33:27 -0000, you wrote:
>I can't believe a search on 42,000 records didn't find anything on
>the word "fade"!!!
>
>I'm trying to fade in some text (with preset shader "glass") in an
>animation: it is supposed to start out totally transparent (I don't
>want to see it yet) and I have the "No light interactions when fully
>transparent" box checked in the text's shader (does that only apply
>to glow?).
>
>Anyway, I have all shader elements set to either "NONE" or "VALUE"
>and all values are set to zero (0%), except for transparency which
>starts at 100%. When I play the animation timeline while viewing my
>working box, the text appears to fade-in just fine, but when I
>render the animation the text is still visible from the start. The
>light on the stage comes from several spot lights with "light cone"
>enabled, so I have background color, but they are not actually
>pointing at the text. I just want the text to fade in and refract
>the background colors, then in the end I want it to fade out again.
>
>There MUST be an easy way to SLOWLY fade things in and out from
>invisible to visible while retaining all the shader properties!
Yes, one thing that has changed in carrara is the way transparency
works. First of all, you must have the color set to black (or zero)
for an object to be fully transparent (and invisible). So a mixer
with a value in the mixing channel, your existing color in the mixer
channel, and a value of zero in the remaining channel (fix it so that
zero is full color, 100% is black), then move that slider in concert
with the transparency slider. If you have a color in transparency,
you must treat it the same way.
Since you are refracting the background colors, you may want to do the
same thing with the refraction value, but remember that those
refraction values get very odd when they get to high numbers.
Also: "none" is not the same as a value of zero. Value zero
recommended.
No light interactions when fully transparent applies to the whole
object. You must also have "light through transparency" and
"transparency" checked as options in the renderer...
hope that this helps a bit.
Harvey
>
>Any suggestions?
>
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