Thursday, April 16, 2009

Hatch marks

What's up with those hatch marks? Is my sphere just too dark? Should I pick light grey instead of almost black? I dunno.

I've picked three variables to change and see when the hatch marks show up:
  1. Are the refracted rays rendered?
  2. Is the diffuse component rendered?
  3. Are the reflected rays rendered?

Image Refract Diffuse Reflection Hatching
no no no no
yes no no yes
no yes no no
yes yes no yes
no no yes no
yes no yes yes
no yes yes no
yes yes yes yes

Only when refraction is enabled do we see the hatch marks. This narrows it down to the following:

  1. Specular highlights
  2. Direction of refracted ray
  3. Fresnel term
  4. Tone mapping
  5. And probably about 10 other things

Things that did not remove the hatch marks:
Removing tone mapping
Removing specular highlights

Removing the specular highlight does not remove the hatch marks. I'm not going to bother posting a pic. It looks like the sphere with everything enabled, just no specular highlight.

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