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matthewnicholas

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Reply with quote  #1 
I'm trying to create an LEM that has a texture on it.  The goal is to have a screen (computer, tv, front/rear projection) displaying an image.  Clearly just creating an LEM from the face that has a texture applied yeilds only a glowing monocrhome surface.  Is there a way to get this to work, or does anyone have any suggestions as to a way to get this effect to work?

michaliszissiou

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Reply with quote  #2 
What about another face in front of a lem (a transparent photo)? Some high contrast is needed.
matthewnicholas

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Reply with quote  #3 
tried that, just showed as clear like a window

bigstick

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Reply with quote  #4 
This does work, but the opacity needs to be very high. In this example, opacity is set to 95% and LEM power is 1.

These settings are for V2. With higher light power and more transparency it won't work.

Attached Images
png LEM_-_transparency_test_2010-06-07_21595100000.png (116.01 KB, 159 views)
png LEM_-_transparency_test_2010-06-07_21583100000.png (155.98 KB, 184 views)


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matthewnicholas

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Reply with quote  #5 
Not quite right, plus i can't get v2 to work well enough at the moment.  What i did that seems to work was "shutter" off a spot light.  You have to have a ton of room unfortunately to get the baffle out of the render frame, but it looks pretty good.  Basically i created a spot light then backed it way up.  Next i created a rectangular plane in front of it and cut a hole the ration of my screen into it.  After moving it around a bit i got it to line up so the only thing that was illuminated was the projection surface.  It would be great if textures could acctually emit light at some point in v2, i've used other ray tracers that handle it- just cuts down on modeling time.

If anyone else has some other ideas it would be nice to see something that takes less time to do.

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jpeg 20100607161815_45s.jpg (28.05 KB, 161 views)

michaliszissiou

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Reply with quote  #6 
Or you can do this. Assign a texture (colour) for screen surface, make it pure magenta, export a same res 2d raw SU render, then open the two images in pshop and select magenta (invert), select the podium render layer and ctrl+j (layer via copy). Now you can edit the lower layer as you like. Here is an example, how I did all these reflections in my posted 'ruined house'. Assigned magenta for all glass textures. There is a ruby plug in (it makes the same but crashes SU some times). 

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jpeg Mask.jpg (97.43 KB, 123 views)

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