• Maxon Cinema 4D

  HDR in a Room

  Posted by Tom Slattery on October 16, 2009 at 1:12 am

  I am working with a room scene lit by HDR. My problem is that the shot needs to show the ceiling of the room, which blocks a lot of the light generated by GI. I’ve experimented with compositing tags to exclude the ceiling – yet have it lit realistically – with no good results.

  Thanks!
  ~TPS

  Adam Trachtenberg replied 16 years, 6 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Adam Trachtenberg

  October 16, 2009 at 4:05 am

  I think you would need to have compositing tags on the walls and ceiling with “seen by GI” unchecked. Seen by GI controls whether or not an object casts GI shadows. If it’s unchecked the object will receive, but not cast GI shadows. You might want to do the same for the floor.

  Another option would be to have a wide spotlight pointing up at the ceiling.
• 

  Tom Slattery

  October 16, 2009 at 3:02 pm

  Ah…I see. I was unchecking ‘receive shadows’ in the compositing tag, but I see this works better.

  I pointed an area light from the floor towards the ceiling with an include in the light for only the ceiling. Those two combined got the results I was looking for: the HDR look with the lighting I wanted.

  Thanks!
  ~TPS
• 

  Adam Trachtenberg

  October 17, 2009 at 4:48 pm

  Yep, “receive shadows” only applies to shadows from light objects. “seen by GI” does the same thing with respect to GI shadows.

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