Enhancements

• AOV support in standard shader: The standard shader now writes to eight different AOVs: (trac#1791)

  emission
  direct_diffuse
  direct_specular
  indirect_diffuse
  indirect_specular
  reflection
  refraction
  sss
  

• Better AOV type checking: You will now get a warning message if you try to write to an AOV specifying the wrong output type: (trac#1792)

  00:00:00    6mb         |  starting 2 bucket workers of size 64x64 ...
  00:00:00    7mb WARNING |   [aov] type mismatch for "direct_diffuse" (RGB vs RGBA)
  00:00:02    7mb         |  bucket workers done in 0:02.05
  

• Added standard.roughness parameter: The diffuse layer in the standard shader uses a Lambert BRDF when roughness is zero (the default value) and an Oren-Nayar BRDF when roughness is greater than zero. The range is from 0 to Pi. (trac#1796)
• New utility shader mode bad_uvs: This new mode helps when debugging problematic geometry, by clearly marking polygons where UV mapping is broken (zero or non-finite derivatives). Problems in the U coordinate are shown as red polygons, and problems in the V coordinate are shown as blue. (trac#1800)

Incompatible changes

• Removed legacy catclark_subdiv node: This deprecated node existed solely for backwards compatibility with old scenes in our development testsuite. The polymesh.subdiv parameter, which accepted a catclark_subdiv node, has also been removed. (trac#1790)
• Removed curves.self_intersectable parameter: This fixes the ugly self-shadowing artifacts that you would get in ribbon mode with the default settings. (trac#1798)
• Removed min() and max() Python methods: These two AtPoint methods in the Python bindings were causing problems because they were aliasing the built-in Python functions. (trac#1799)

Bug fixes