Hey all?
How would you create decent looking underwater caustics? Is there a way to use Gobos or similar maps to affect light intensity; that would be my first guess to create the effect, but I can't seem to get it work.
Thanks,
Underwater Caustics
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Currently sunlight does not cast caustics in this way.
You need to use an HDR and place a sphere or disc (low poly) at a large distance so simulate a sun with an area light, then render with PMC.
You just need to displace the water geometry for wind/motion first, then export to octane and render.
You need to use an HDR and place a sphere or disc (low poly) at a large distance so simulate a sun with an area light, then render with PMC.
You just need to displace the water geometry for wind/motion first, then export to octane and render.
Win 7 x64 & ubuntu | 2x GTX480 | Quad 2.66GHz | 8GB
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telemmaite
- Posts: 77
- Joined: Tue Jun 01, 2010 7:50 am
- Location: Sofia,Bulgaria
I am also trying to get any underwater caustics using emitter + hdri. No success . Can you show me at least some that had achieved the result with octane?
i5 2500K 4.7Ghz | Ram 4GB 1600mhz Kingston | Palit GTX 470 | Win7 64x | Octane with Blender 2.59
dude, you´re crazy. I highly suggest to use a different approach:
Render your scene in octane without caustics.
Now generate a caustic texture in the desired resolution. Still frame or as a loopable animation.
Use this tool to accomplish the task easily:
http://www.dualheights.se/caustics/
it´s also available in a "free" version.
Back in your 3D core app:
Apply this caustic texture to your geometry using projection mapping (from above).
Render the scene conventionally as separate pass/layer and screen/lighten/add this in post over the image you got from octane.
done.
edit:
oh, I see that the free version of the caustic generator supports only a resolution of 512x512.
So better use some texture-tiling or get in touch with the pro-version.
I did a quick 10-minute example: check out the attachment.
Render your scene in octane without caustics.
Now generate a caustic texture in the desired resolution. Still frame or as a loopable animation.
Use this tool to accomplish the task easily:
http://www.dualheights.se/caustics/
it´s also available in a "free" version.
Back in your 3D core app:
Apply this caustic texture to your geometry using projection mapping (from above).
Render the scene conventionally as separate pass/layer and screen/lighten/add this in post over the image you got from octane.
done.
edit:
oh, I see that the free version of the caustic generator supports only a resolution of 512x512.
So better use some texture-tiling or get in touch with the pro-version.
I did a quick 10-minute example: check out the attachment.
- Attachments
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Win 7 x64 | GTX770 Phantom 2GB | Phenom II X6 3.2GHz | 16GB