Shadows not right with Area Lights

adamkunz
New Member

Posts: 4

Shadows not right with Area Lights Oct 20, 2021 1:45:38 GMT

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Post by adamkunz on Oct 20, 2021 1:45:38 GMT

I'm 4 hours in rereading/reimplementing area lights and soft shadows.

I don't know what I'm missing. From the images, it looks like it rendering the original shadow, just lighter on the edges...but from the example images, it looks like the soft shadows are actually more distorted/spread out than the point light shadows.

I've also only noticed a slow down of <5x when going from 4 samples (90ms) to 64 samples (500ms). Makes me feel like I'm missing something there too. I was really expecting this thing to grind to a halt.

Any suggestions on where to look would be appreciated. So far, all tests are passing.

4 samples

64 samples

adamkunz
New Member

Posts: 4

Shadows not right with Area Lights Oct 20, 2021 1:51:45 GMT

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Post by adamkunz on Oct 20, 2021 1:51:45 GMT

Feelin' silly. 30 seconds after posting, I figured it out. I got myself all confused about when is_shadowed() should be called. Ended up I was still calculating isInShadow at the beginning of the lighting() method and only calculating intensityAt() if isInShadow() was true. I totally missed that intensityAt() is calling is_shadowed() using the samples of the area light.

Thanks for being my rubber duck!

Here's the same image as before with 64 samples:

Last Edit: Oct 20, 2021 1:52:14 GMT by adamkunz

Jamis Administrator Posts: 310	Shadows not right with Area Lights Oct 20, 2021 3:50:25 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Jamis on Oct 20, 2021 3:50:25 GMT I'm glad you figured it out! Your render looks great.

Post by adamkunz on Oct 20, 2021 1:45:38 GMT

Post by adamkunz on Oct 20, 2021 1:51:45 GMT

Post by Jamis on Oct 20, 2021 3:50:25 GMT