How to eliminate light effect through the wall
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2005-06-11
11:33 AM
- last edited on
2023-05-11
12:37 PM
by
Noemi Balogh

Light source from left area

Light effect through the right area
How can I restrict the light so it can't effect to other room? Please help me, thank you very much!
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2005-06-11 01:39 PM
Go to Image > PhotoRendering Setting > LightWorks Effects > Shadow Casting then turn on the "HARD" radio button on. If I use "BY LAMP SETTING" the result light effected to other room.
Then the result is


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2005-06-12 06:02 PM
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2005-06-12 07:47 PM
Dwight wrote:Dwight, thanks a lot for your reply
But that is a bad solution because in a real scene, having an overall shadow casting control of "hard" will affect all the lights, making the scene harsh. A better solution is to use a proper shadow casting light like the wall light indirect - the most sophisticated of the ArchiCAD/LightWorks lamps.

I will try your solution then, trully I didn't compare between using "hard" mode and "BY LAMP SETTING" so I will compare it later. But how come this problem happen? Is this a bug from the light source, because I try another light source from Archibase and the result is same, the light effected another room......


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2005-06-12 07:59 PM
You need to overlap lights with medium fall off to emulate a general light that casts shadows, but thinking like a photographer, using the three photo light types: key, model and fill, is a better approach.
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2005-06-13 09:01 AM
Dwight wrote:Most 3D software solves this by rendering an omni light as if it where six spotlights, so the shadow casting calculation is back to normal.
General light sources don't cast shadows because they are omnidirectional - and the math to caculate shadows from an imnidirectional source results in INFINITY. Imagine how long a rendering would take, then!
Cinema4D even manages to calculate transparancy in the shadows even for soft shadows (using shadow maps instead of raytracing).
ArchiCAD lightsources never had much control built in... So to be abel to exploit LightWorks capabilities, do not use default ArchiCAD light sources, since they lack parameters. Even if you would script the light in GDL, the native ArchiCAD-engine misses control over the light.
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2005-06-14 09:54 AM

Or maybe I can get an easier answer/solution from you too?


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2005-06-14 03:32 PM
general light that casts shadoze = light cone down and light cone up at 160 degrees aimed at each other about 1.5 meter apart. sort of.
where did you find the fawning berry?
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2005-06-15 08:47 AM
where did you find the fawning berry?I collect smiley/emoticon from everywhere. Some program like GetSmile have a lot of collection. Here's some funny one:
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