Solid Angle Katana to Arnold 2.3.1.0 for Katana 3 & 3.1
Title: Solid Angle Katana to Arnold 2.3.1.0 for Katana 3 & 3.1
Info:
Arnold for Katana (or KtoA) provides a bridge to the Arnold renderer from within the standard Katana interface.
Features:
Natural integration with Katana nodes, scenegraph, and scripting.
Multi-threaded scene translation, made possible by Geolib3 in Katana 2.
Bundled Arnold, shaders, and plugins for a smooth out-of-the-box experience.
Support for the latest Arnold 4.2.x series.
Improved interactivity for live rendering (IPR) allows look changes to be rapidly previewed.
Ultra-fast OpenVDB volume rendering.
Shader networks.
Works with third-party shaders and renderer procedurals (for hair, etc).
Render outputs and AOVs, including Deep EXR.
Supports the curves location type in Katana for hair rendering.
Many light types and light filters supported, as well as interactive modification of lights.
Object parameters and global options better match what is available in Arnold.
Improved documentation within Katana (args files).
Changes 2.3.1.0
Enhancements
Update to Arnold 5.3.1: Updated to Arnold 5.3.1. See the release notes for more information. (#288)
Node creation menus and hotkeys: Two new pop-up menus have been added for easily creating Arnold nodes in the node editor (default hotkey shift+Z) and Arnold shading nodes (default hotkey alt+Z). You can enable/disable the menus, change hotkeys, and even menu colors with the environment variables KTOA_DISABLE_NODE_MENU, KTOA_NODE_MENU_HOTKEY, KTOA_DISABLE_SHADER_MENU, KTOA_SHADER_MENU_HOTKEY, KTOA_SHADER_COLOR_BUILTIN_GPU, KTOA_SHADER_COLOR_BUILTIN_CPU, and KTOA_SHADER_COLOR_THIRD_PARTY. See the README file for more information on the environment variables. (#377)
Metadata to customize shader parameters: Placing a file named ktoa.mtd next to your custom shaders allows you to customize a few aspects of shader parameters. For example, you can construct a proper Katana ramp widget, or you can change the default value of a shader parameter, or even hide a shader parameter. For examples of syntax, please see the file ktoa.mtd in the RenderPlugins directory in your KtoA installation. (#86)
Arbitrary data handling: Arbitrary data translation has improved: (#378)
Locations of type curves now accept uniform (face scope) and varying (point scope) arbitrary data properly.
All other locations properly check their arbitrary data amounts to make sure they fit within the limits of the underlying primitive. Instanced geometry will also check against the original source geometry. If you previously set invalid arbitrary data, it will now issue warning telling you so and not pass it along to Arnold.
Texture arbitrary data is accepted as an alias of st, as many Katana primitives now set Texture data in addition to or instead of st.
Arbitrary data translation performance has improved substantially and reduces time to prepare the scene for rendering when there is significant amounts of arbitrary data.
MaterialX export: A new node ArnoldMaterialXBake will allow exporting a selection of locations with their corresponding materials, labeled with a MaterialX look. This can be brought back in later with an Arnold operator (arnoldOperator shader slot, applied to procedurals or to the globals) to apply the look. (#383)
Arnold operator export: A new node ArnoldOperatorBake will allow exporting any operators attached to procedurals or to the global options (scene-level operators) to a .ass file. (#385)
OSL inline shader node: The shader osl has been implemented, so you can dynamically change the code of an OSL shader and have the parameters update in Katana’s UI. Currently known limitations: (#133)
Only int, float, point, vector, normal, color and string parameters are supported.
Default values are always zero for parameters.
Widgets are not set for color parameters.
Only one output parameter is supported.
No array or structured input or output parameters.
Closures are not supported.
Only a single shader can be defined on each node.
Including other header files are not supported.
Global variables (u, v, etc.) are not supported as parameter defaults.
We plan on removing most of these limitations in future releases.
OSL inline shader workflow:
After editing the code, either externally or in the code editor, the Compile button needs to be pressed to generate the parameters. In case of a compilation error, no parameters will be added to the node, and a compilation_errors text field will contain the errors from the OSL compiler.
The code and the parameters can be compiled using python, for example:
osl = NodegraphAPI.GetNode(‘myNode’)
from ktoa import recompileOSL
recompileOSL(osl)
errors = osl.getParameter(‘parameters.compilation_errors’)
if errors is None:
# successful compilation
pass
else:
print(‘Errors: \n%s’ % errors.getValue(0.0))
Bug Fixes
#379 Update AA_samples_max default to 20 like the core
#382 Update renderer info and update script versions to 5.3.x.x
#389 Katana 3.1 live rendering won’t show all rendered pixels
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