Blender Git Loki

Fix failure to add import OpenVDB file when .blend file is saved

Volumes: step towards support per-grid transform for Cycles

The transform is used for texture lookup, but not bounds yet.

Cleanup: add ImageKey to avoid longer argument lists and duplicated code

Volumes: work towards per-grid transform in Eevee

But not actually working yet.

Cleanup: more refactoring of GPU material requested attributes/textures

Volume grids are now handled separately from image textures.

Fix volume object showing voxels in wireframe mode

Volumes: add wireframe display using OpenVDB tree nodes

With display option for none / bounds / coarse / fine wireframe. This is
particularly useful in heavy scenes, where you might not want to load any
voxel data for the viewport.

Volumes: more fiddling with transforms in Eevee and workbench

Still not quite right, but needed for wireframes to work.

Volumes: improve openvdb grid access API, split off render utilities

Fix Eevee volume tests failures due to wrong transforms

Volume: support arbitray number of grids for Eevee shaders

Smoke: put density/color in separate textrues, fixes for workbench shader

This is more in line with standard grids and means we don't have to make as
many special exceptions in the shading code.

The workbench shader was also changed to fix bugs where squared density was
used, and the smoke color would affect the density.

Volumes: use VDB transform matrix for Eevee

Still only from the first grid, not multiple transforms.

Volumes: better integration into workbench drawing

* Respect workbench object/material/single/random color
* Add viewport display panel, with density scale setting
* Memory usage: half float and only needed channels for OpenGL textures
* Various bugfixes

Merge branch 'master' into new-object-types

Fix broken Eevee final render of new volume object

Volumes: show data type in grids list

Cleanup: don't perform some GPU shader codegen operations twice

Volumes: API functions to modify grids in the modifiers stack

Volumes: avoid unnecessarily unloading volume in some corner cases