Problem with light-sources- (No problem in 3DS!)

Problem with light-sources- (No problem in 3DS!)

Post by michael schebest » Tue, 30 Jan 1996 04:00:00



Hello there,
Im a light-wave beginner (Iused to work with 3DS)
The problem I have is the following: I want to define specific
objects to be acitve for a specific light source.(No problem in
3DS and I used it quiet often). Does anybody know any solutions
for my problem.

If you can, send me an eMail ( I don't read the news very often )
Thanks

Michael

 
 
 

Problem with light-sources- (No problem in 3DS!)

Post by je.. » Wed, 31 Jan 1996 04:00:00



>  Hello there,
>  Im a light-wave beginner (Iused to work with 3DS)
>  The problem I have is the following: I want to define specific
>  objects to be acitve for a specific light source.(No problem in
>  3DS and I used it quiet often). Does anybody know any solutions
>  for my problem.

        You can't.  If you really need to do it, back to 3DS.

        (That is, if you need to do it in one pass.)

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Problem with light-sources- (No problem in 3DS!)

Post by michael schebest » Sat, 03 Feb 1996 04:00:00


Quote:>Hello there,
>Im a light-wave beginner (Iused to work with 3DS)
>The problem I have is the following: I want to define specific
>objects to be acitve for a specific light source.(No problem in
>3DS and I used it quiet often). Does anybody know any solutions
>for my problem.

>If you can, send me an eMail ( I don't read the news very often )
>Thanks

>Michael

Hello again,
I received a lot of answers, but apparantly there is no solution
for this problem.

For all who answered me: thanks for your help. It looks like 3DS
has a big effort (I hope it's the only one ;-) ) See you later...

Michael

 
 
 

1. Problem understanding light sources

I have a fairly simple scene with object located around the origin.

The CAMERA statement is as follows:

camera
{
  location <0, 0, -9>
  right 1 * x
  up    1 * y
  look_at <0, 0, 0>

  blur_samples 7
  confidence 0.5             // default is 0.9
  variance 1/64              // default is 1/128 (0.0078125)
  #warning "\nFast focal blur used...\n"

and the LIGHT SOURCES as follows:

light_source { <50, 50, -100> color red 0.7 green 0.7 blue 0.7 }
light_source { <0, 3, -10000> color red 0.7 green 0.7 blue 0.7 }

My problem is the fact that I have an object in front of another
object (a pencil in front of a stack of childrens ABC blocks to
be exact) and there is a strong shadow of the pencil cast on the
blocks from the second light source (far away means very parallel
rays of light arrive at my objects).  If I remove the second light
source then the scene is very, very dark.  I can even increase the
intensity of the first light source and the scene remains very,
very dark.

Why does a light source on the moon cast such a strong light (much
stronger than the nearer light source that is up and to the right?

Must I use an area light to get realistic shadows, or what is the
problem?

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