Blender Git Loki

GPUTexture: Support for nearest sampling with mipmaps.

Remove length argument since it's stored in the property

Missed in last commit

Manipulator: properties into 'wmManipulator'

We normally only have one or two, don't have a separate linked list.
Also store type in the property.

Cycles: Fix excessive sampling weight of glossy Principled BSDF components

If there was any specularity in the Principled BSDF, it would get a sampling
weight of one regardless of its actual impact.

This commit makes Cycles estimate the contribution of the component and adjust
the weighting accordingly, which greatly improves the noise characteristics of
the Principled BSDF in many cases.

Note that this commit might slightly change the brightness of areas when using
MultiGGX and high roughnesses, but the new brightness is more accurate and
closer to the result of Branched Path Tracing. See T51836 for details.

Differential Revision: https://developer.blender.org/D2677

Fix T51836: Cycles: Fix incorrect PDF approximations of the MultiGGX closures

The PDF of the MultiGGX sampling is approximated by the singlescattering GGX
term as well as a scaled diffuse term that makes up for the energy in the
multiscattering component that's missed by GGX.

However, there were two problems with the glossy terms: The diffuse term missed
a normalization factor, and the singlescattering term was not properly scaled
down based on the albedo estimate.

The glass term was completely wrong and has been rewritten. It uses the fresnel
factor to weight reflection vs. refraction and uses the glossy MultiGGX model
for reflection.
For refraction, the correct singlescattering term is now used, and a new
albedo approximation is used that was derived by evaluating GGX albedo for
roughnesses from 0 to 1 and IORs from 1 to 3 and fitting numerical
approximations to it. The resulting model has a mean relative error of 9e-5,
but could probably be simplified without losing noticable accuracy in the
final render.

The improved PDFs help with glossy highlights (due to better light sampling vs.
closure sampling MIS) and fix the situation described in T51836 where mixing
MultiGGX with other closures (as it happens in e.g. the Principled
BSDF) causes incorrect darkening.

PyAPI: Add Manipulator.target_prop_set_property

RNA method for Python to call into C or Py defined manipulators.
naming might change.

Fix T51837: Added num particles sanity check when reading particle files. Also fixed num particles field for pVel files

Added topograb.png

Fix T51862: principled shader GLSL artifacts in ortho mode.

Rename functions and structs to new Gawain naming

As this branch is not the current blender2.8, these renaming was missing in grease pencil new code.

Fix merge error

Topograb final Implementaion Part 1

Fix T51849: change Cycles clearcoat gloss to roughness.

This is compatible with UE4 and more consistent with specular and transmission
roughness, even if it deviates from the original Disney BRDF.

Topo Grab topo_init done

Merge branch 'blender2.8' into greasepencil-object

WIP: Add a temp framebuffer to control z-depth

The stroke is rendered to temporary framebuffer and then render again using fullscreenquad to add the z-depth.

This cannot be done in one step because the strokes must keep the internal layers order without using z-depth values.

Still some problems with z-depth texture.

Merge remote-tracking branch 'origin/master' into blender2.8

take position for constraint between both rigidbodies for fixed constraints now, too

Fix typo in builtbot config