Solid Angle Katana 3.2-3.6 to Arnold | 1.6 Gb
The Arnoldrenderer product team is pleased to announce the availability of Arnold (or KtoA) for Katana. KtoA is a minor feature release, using Arnold


- Automatic file path remapping: String parameter values can now be automatically modified according to the OS Arnold is running on. For example, this is useful when the artist workstations are running Windows but the renderfarm nodes are running Linux. Configuration is done with a JSON file that contains the strings to search and replace for each OS. This configuration file can be selected through the ARNOLD_PATHMAP environment variable.  (#9311)  For example:

Rim light control for the Toon shader: A new rim_light_tint float parameter was added to the toon shader to tint the color of the rim light using the base color of the surface. See the full documentation. (#9003)

Performance improvements on Windows with many cores and texture-heavy scenes: Several performance improvements have been made, particularly for those running Windows, using many cores, tiff based textures, and/or reading many textures/sec. Expected speedups can be anywhere from a few percent to orders of magnitude faster on many-core Windows machines. (#9515, #9685, #9686, #9695, #9709, #9761) For a medium complexity scene that uses exr based .tx textures we get the following speedups on Windows :

- String parameter path metadata:  A new path metadata can be assigned to string parameters to give specific hints about how they will be handled. Currently available values are: file, folder and folderlist. Arnold will expand environment variables, apply the remapping, and handle backslashes on string parameters with the metadata. (#4969)
- AA_adaptive_threshold in log: The options.AA_adaptive_threshold used is now output in the log file. (#9841)
- Upgraded OSL:  Arnold now uses OSL 1.11.6 bringing multiple optimizations and bug fixes, see the full list of changes. (#8917)

GPU Enhancements

- Global AOV shaders: The aov_shader option is now supported on GPU. This option defines a list of shaders that the renderer will evaluate after the regular surface shader. With this, it's possible to add shaders to set specific AOVs without modifying the original shader tree. See the option documentation. (#9394)
- Initial support for attributes in OSL:   You can now retrieve user data bound to shapes via the getattribute function or via a lockgeom parameter attribute. This initial implementation still has some limitations when compared to the CPU implementation. Queryable attributes are currently restricted to those bound to the current shaded shape and attributes of the active render camera. Querying node parameters is also not yet supported. (#9666)
- Initial support for tracing in OSL:   You can now use the trace function to trace rays in OSL shaders along with the getmessage function to retrieve information regarding any intersected object. This initial implementation has the restriction that you cannot yet query parameters on an intersected object. (#9797)

USD enhancements

- UsdRender schema: UsdRenderSetting, UsdRenderProduct and UsdRenderVar are now supported in the procedural. (usd#453)
- Improved Solaris Primvar support: Primvars with arrays of a single element are converted to non-array user data in Arnold. This improves primvar support in Houdini Solaris. (usd#456, usd#463, usd#478)
- Curve support in the render delegate: Curves now render in the Arnold render delegate (usd#483)

Incompatible Changes

- AiMsg* changes: Changes have been made to how logging behaves. Now the log session is for the life of the Arnold process instead of just between AiBegin/AiEnd pairs. If messages are not showing up or too many messages show up, you might need to set the logging flags and other options before calling AiBegin. Another change is that you can now set the log filename at any point in time, each time AiMsgSetLogFileName is called the previous file will be closed and the new file will be created. See the API documentation for the full set of functions. (#9575)
- Increased default texture maximum memory: The options.texture_max_memory_MB default value has been raised from 2048MB to 4096MB. (#9846)   

ktoa#491: No ARNOLD_PLUGIN_PATH env var breaks the inline OSL node

    #9828 AiMetaDataGet/Set functions crash with a NULL node entry
    #9746 [Alembic] sampled faceset data causes crash
    #9816 [Alembic] Velocities data on curves not applied correctly
    #9515 Allow IPR to properly scale past 64 cores on Windows
    #9809 Allow maketx to use either single dash or double dashes for arguments
    #9684 Arnold ignores non-linear output color spaces on images wider than 8 bit
    #9020 Back slashes in strings get changed to forward slashes when queried or written to .ass
    #9672 Better duplicate output detection
    #9749 BVH with 3+ motion keys is missing AiProfileBlock
    #9575 Crash when calling AiMsg while the Arnold session is ending
    #9725 [GPU] Arnold prematurely runs out of memory with on demand textures
    #9748 [GPU] Crash in GPU prepare when failing to compile programs
    #9794 [GPU] fov not set when using custom perspective camera
    #9852 [GPU] GPU crash with multiple shaders connected to the UV camera post_bake
    #9580 [GPU] Incorrect "Insufficient device memory" error when using NVLink
    #9692 [GPU] Incorrect result when calling user data shaders from uv_camera.post_bake
    #9771 [GPU] OptiX denoiser incorrectly accumulates feature buffers in progressive mode with multiple filters
    #9774 [GPU] OSL: Don't throw exceptions when getattribute is called
    #9636 [GPU] OSL texture crash when toggling devices
    #9202 [GPU] Precision issue in bump mapping
    #9532 [GPU] Random crash during                                                                                                                                                                                                          the GPU prepare stage
    #9801 [GPU] "Unable to load Optix library" error on Tesla and TCC GPUs on Windows
    #8956 kick logs show superfluous plugin loading messages before official log start
    #9758 Make smart opaque robust to numerical precision error
    #7934 mesh_light with degenerate triangles has poor performance
    #9522 [OSL] Arnold can fail to find stdosl.h when the path to Arnold contains specific characters on Windows
    #9840 [OSL] Crash when SIP is enabled on MacOS 10.14 when using OSL
    #9607 Parsing errors in ass file parameters should abort scene loading
    #9659 Potential memory leak when using _triggers_reinitialize metadata
    #9753 Prevent texture cache from being smaller than 2GB
    #9863 Print license error details at warning level
    #9845 Python binding for AiParamGetType returns c_int instead of c_uint8
    #9762 Slow build with many ginstances of many-prim objects
    #9595 Slow node update of VDB volumes on Windows and Linux even when volume did not change
    #9610 Spurious render message when using -default_nodes in kick
    #9644 Using AOV write shaders increases texture usage
    #9638 Wrong exterior illumination with portal lights in interior_exterior mode
    usd#463 Texture coordinates of texcoord2f type are not read correctly   

Katana's highly efficient,     collaborative approach to lighting and look development gives you the creative scope and scalability to meet the needs of today's most demanding CG-rendering projects. Equally suited to both short and long-form animation and VFX projects, Katana's unique design lets you work with massive scenes and high volumes of shots; easily reuse looks; and make revisions without repeating scene setup work, so you can spend more time achieving higher quality results.

Solid Angle SL     is the technology company behind the Arnold rendering software, with offices in Madrid and London and customers throughout the world including Framestore, DreamWorks, ILM, Sony Pictures Imageworks, MPC, The Mill, Mikros Image and Rising Sun Pictures. Arnold was designed from the ground up to efficiently raytrace the complex geometric datasets required for feature­-length CGI animation and big­ budget visual effects, while at the same time simplifying the pipeline, reducing the number of passes, minimizing storage requirements and greatly enhancing interactivity for lighting artists.

Product: Solid Angle Katana to Arnold
Supported Architectures: x64
Website Home Page :


Language: english
System Requirements: PC / Linux *
Size: 1.6 Gb

Compatible Katana Versions
- Katana 3.2v1+
- Katana 3.5v1+
- Katana 3.6v1+

System Requirements
- Windows 7 or later, with the Visual Studio 2015 redistributable
- Linux with at least glibc 2.12 and libstdc++ 3.4.13 (gcc 4.4.7). This is equivalent to RHEL/CentOS 6
- CPUs need to support the SSE4.1 instruction set
- Optix denoiser requires an NVidia GPU with CUDA Compute Capability 5.0 and above
- Arnold GPU works on Linux and Windows and requires an NVIDIA GPU of the Turing, Volta, Pascal, or Maxwell architecture. We recommend using the 450.57 or higher drivers on Linux and 451.77 or higher on Windows.

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