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Gobo visible on two sides of a surface
Posted: 16 July 2018 07:39 PM   [ Ignore ]  
Total Posts:  434
Joined  2012-01-05

Hello!

I’m trying to simulate a series of projectors hitting semi transparent surfaces, a bit like here
http://www.alexczetwertynski.com/#/milly-fall-17-show/

The problem I’m having is that I can’t seem to get the light to cover both sides of my surfaces (which makes some sense), but then I’d like to texture the back side of my planes to match the effect the gobo is creating.
Here is a scene to explain a bit more…
https://www.dropbox.com/s/ezgwc9qt7lkxwys/RotationofProjection.zip?dl=0

Thanks!

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Posted: 16 July 2018 09:47 PM   [ Ignore ]   [ # 1 ]  
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Joined  2011-03-04

Hi Alex,

Thanks for the nice preparation of the question.

Here is your file back, without the textures, you might just drag them into the tex folder.
You will find also two examples of ways to do it, one with light and one with camera projection. In the two example files I placed a sphere as spy in it.

Scene files:
https://www.amazon.com/clouddrive/share/8h3E1w3UrQgPjxHxvToUl3z5OlDlmiTPKU9h5MFHKZA

Thee key element is certainly a fine balance of the Backlight Shader and the front surface. In your example scene I balance that in the Transparency Channel with the Normal Direction Shader.

Please not as well that the shine through to the floor of the light can be switched off in Light> Shadow> Transparency

Let me know if there is any question

Cheers

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