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David Lemelin

Problems projecting a light pattern

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Hi, I'm creating an image that features a light pattern being projected onto the floor. I am having trouble creating this effect....

I've tried creating an emitter with a black and white HDR, but the black areas don't allow the flooring to show through... I get a black rectangle with my light caustics.

I've tried creating an MXM in MXED, but when I bring it into FormZ, it doesn't work at all... I get a white square instead.

I'm about to give up and just do this in post in Photoshop... but it bugs me this is causing me so much trouble... anyone have any experience trying to create this effect?

The images included below are 1) the emitter material alone with no other light sources. 2) The scene with the colored ambient lights (where you see the background of my light pattern). 3) the floor without the light pattern. 4) a PNG version of the EXR file I'm trying to use to create this light pattern on the floor.


Screen Shot 2019-12-09 at 2.32.49 PM.png

Screen Shot 2019-12-09 at 2.34.32 PM.png

Screen Shot 2019-12-09 at 2.36.17 PM.png

water caustics.png

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Hi David,

I've done this before using the Maxwell plugin projector light.

To get good results the light needs to be cranked up really high and the waves map having contrast set high as well.




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