CGTalk - lighting problem

xyno

10-09-2002, 03:06 PM

i have a problem with the light in this picture
it seems that light is going through a solid structure creating a line of light at a place no light is coming. the two solids are overlapping so there is no space between the two. i used radiosity in this render but it also shows without radiosity. i think i saw a thread about this a while ago, but i couldn't find it anymore. i got it to go smaller when i made the shadow map size bigger, but it only helped a little. what settings should i change to make this go away?

http://home.wanadoo.nl/xyno/lightproblem.jpg

LucentDreams

10-09-2002, 06:05 PM

try relative in stead of absolute and lets us know how that works out. sorry owuld give better answer bt doing five things at once here.

Mike Abbott

10-09-2002, 06:36 PM

You need to work with:

* shadow bias (reduce it) - and as suggested, try absolute on / off
* shadow map size - increase it
* if you can - use a shadow cone on your shadow casting light which is aimed at, and a tight fit, the object you want to cast shows. (view > active object with the light selected to aim it).

If all fails - as you probably realise, hard shadows will fix it.

HTH

Mike Abbott

PS: this is a common failing of this type of shadow method - it's not something specific to Cinema.

xyno

10-09-2002, 06:53 PM

thanks

reducing the bias did the trick this time. now i can finally continue without getting frustrated about this all the time.

xyno

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