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Topic: HDRI: Non-direct shadow density
posted by 586
archived on 17.5.2002
First of all, please excuse the poor quality of the accompanying image - it's just a test render. I was wondering if anyone would have advice/techniques on increasing the density(apparent *darkness*) of the shadow in this image. The only light in the scene is from the kitchen.hdr that we're all familiar with. I'm not particularly fond of adding a directional light to cheat in a shadow, so what can I do to improve the situation?
One last note FYI, I'm using X-Dof for the DOF.
HDRI Test
Follow-ups
A: You have to realize that there is NO light source. The only light is from the environment. While the light value of the pixel is uncampled, the pixel resolution is relatively small. So the size of the pixels in the "sky" is large, a lot like having a lot of large area lights.
On top of that, HDRI do not cast shadows. Shadowed areas are a result of recieving less light. In order to see them make a box on top of a plane, and raise the box off the plane slightly off the plane, you will see the dark area under the box. I only use HDRI only light when I want a really soft look such as an overcast day. The other times I use HDRI light is as a fill light.
A: If your HDR image was made from good enough images with large difference in exposition times (or f-stop), result would be better, so your shadows would be more noticeable too. Render a test with Direct Computation, it helps you to see the best result in regard of the shadow density.
A: I've only been using VRay Basic w/ the Brazil HDRI Loader so I can imagine it would be easier in advanced with the built in loader.
Had a little luck with upping the white point and playing with the output. These techniques are demonstrated in the help file with the Brazil Loader. Well anyway, here is an image I was happy with the shadows.
HDRI Shadow Test
MAX/ HDRI Files
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