PDA

View Full Version : How can i let opacity maps cast shadows on geometry in max 4.2 (not a plane!!)

PIXAR
07-05-2002, 02:55 PM
How can i let opacity maps cast shadows on geometry in max 4.2 (not a plane!!).

I need to create tons of animated tree leaves for a background, i saw a technique on rustboy.com where you add a animated movie with leaves on squashed spheres (which move also).

this technique should be very fast with great result (watch his movie in "the making of")

a: but how in max?? ps, raytracing is no option, takes too long to render.

b: which movie extensions support a alpha channel? (or should i do it with a sequence?)
bologna
07-05-2002, 03:08 PM
You can place a map or sequence in a light as a projector. Search for Projector Map for lights.

Hope this helps.
PIXAR
07-05-2002, 03:13 PM
this is my eternal problem, why do i see that heavy light around the shadow?? if a make my fallof and hotspot bigger then the shadow grows to immense sizes!!

http://users.skynet.be/luce/stuff/boom.jpg
Clockwork
07-05-2002, 09:40 PM
If you want to cast your shadows through opacity maps, scrap the use the light as a projector idea, simply switch your light from shadow map to raytraced shadow, it will cast shadows through opacity maps.

I know you said raytraced shadows are not an option, but for realistic results, I'd say do it, Set up your render, go to bed and see what you have in the morning ;)
PIXAR
07-05-2002, 09:56 PM
my problem is solved, thx for the replies!
kandyman
07-05-2002, 10:12 PM
also, look up "overshoot" in the help files.
bologna
07-05-2002, 10:52 PM
And you can adjust the size of the map by dragging a copy(instance) of it from the light to the Material Editor, and adjust it there.

If you don't wan't the light around it like that, try setting the U and V Tile to like .5
CGTalk Moderation
01-13-2006, 10:00 AM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.