Lumion Support Center

Support for unlicensed users => Post here if you can't find your License Key => Topic started by: sach on December 01, 2011, 06:55:23 pm

Title: Reflection problem
Post by: sach on December 01, 2011, 06:55:23 pm
Hi, is there a special reason why with a reflective glass, sometimes, i can't get the reflection of a person in front of that glass.  Some other time, the reflection of an object is way bigger than what the object is.

Thanks

Sacha
Title: Re: Reflection problem
Post by: tug on December 01, 2011, 08:54:49 pm
I found this bug in animated persons, they didn't be reflected!!
Title: Re: Reflection problem
Post by: Morten on December 02, 2011, 10:47:02 am
Hi, is there a special reason why with a reflective glass, sometimes, i can't get the reflection of a person in front of that glass.  Some other time, the reflection of an object is way bigger than what the object is.
Lumion uses cubemap reflections. It's a 360 degree panorama texture rendered from the camera position, and this texture is projected onto all reflective materials.

This reflection technique is a heavily optimised way of doing reflections in real-time 3D graphics, and they will never give you the perfect raytraced reflections that you are expecting to see on the wall. If you wanted this, each frame would take significantly longer to render.

You may get better results by using the "Reflection control" movie effect which allows you to set a single static position for the reflection panorama texture (instead of using the camera position). The effect also allows you to turn off object reflections so that it's only the sky and terrain that are reflected.

Personally, I also reduce the reflection amount in the glass material to make this issue less apparent.

There's some more information about reflections here (and the future of reflections in Lumion):
http://lumion3d.com/forum/index.php?topic=2452.msg15130#msg15130 (http://lumion3d.com/forum/index.php?topic=2452.msg15130#msg15130)
Title: Re: Reflection problem
Post by: Morten on December 02, 2011, 10:47:33 am
I found this bug in animated persons, they didn't be reflected!!

You're right - this bug is also on the bug tracker list.
Title: Re: Reflection problem
Post by: tug on December 02, 2011, 03:29:42 pm
I know I know  ::) :D