mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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128 lines
5.5 KiB
ReStructuredText
128 lines
5.5 KiB
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Copyright 2017 Pixar
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Licensed under the Apache License, Version 2.0 (the "Apache License")
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with the following modification; you may not use this file except in
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compliance with the Apache License and the following modification to it:
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Section 6. Trademarks. is deleted and replaced with:
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6. Trademarks. This License does not grant permission to use the trade
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names, trademarks, service marks, or product names of the Licensor
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and its affiliates, except as required to comply with Section 4(c) of
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the License and to reproduce the content of the NOTICE file.
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You may obtain a copy of the Apache License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the Apache License with the above modification is
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distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the Apache License for the specific
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language governing permissions and limitations under the Apache License.
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Overview of Release 3.2
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=======================
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.. contents::
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:local:
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:backlinks: none
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New Features
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------------
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Face-Varying Stencil Evaluation
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Face-Varying primvar values may now be refined using stencil tables.
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The stencil table for a face-varying channel is created by specifying the desired fvarChannel and setting
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the Far::StencilTableFactory::Option interpolationMode to INTERPOLATE_FACE_VARYING when creating the stencil table.
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1st and 2nd Derivative Evaluation
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The Osd Evaluator API has been extended to support 1st derivative and 2nd partial derivative evaluation for stencils and patches.
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+----------------------------------------------------+------------------------------------------------------+
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| .. image:: images/osd_eval_1st_deriv_normal.png | .. image:: images/osd_eval_2nd_deriv_curvature.png |
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| :align: center | :align: center |
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| :width: 75% | :width: 75% |
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| :target: images/osd_eval_1st_deriv_normal.png | :target: images/osd_eval_2nd_deriv_curvature.png |
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| 1st Derivative Surface Normal | 2nd Derivative Surface Curvature |
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+----------------------------------------------------+------------------------------------------------------+
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On the left is an example of computing a surface normal at each point using the evaluated 1st derivatives,
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while on the right is an example of computing surface curvature at each point using the evaluated 2nd partial derivatives.
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Smooth Corner Patch
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~~~~~~~~~~~~~~~~~~~
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An option has been added to disable the legacy behavior of generating a sharp-corner patch at a smooth corner.
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Corners which are actually sharp will continue to generate sharp-corner patches.
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The differences between the two methods is most apparent at low-levels of feature isolation.
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This feature is controlled by the generateLegacySharpCornerPatches option added to Far::PatchTableFactory::Options.
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+------------------------------------------------------------+-------------------------------------------------------------+
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| .. image:: images/far_legacy_sharp_corner_patch_true.png | .. image:: images/far_legacy_sharp_corner_patch_false.png |
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| :align: center | :align: center |
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| :width: 75% | :width: 75% |
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| :target: images/far_legacy_sharp_corner_patch_true.png | :target: images/far_legacy_sharp_corner_patch_false.png |
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| Sharp Corner Patch (legacy behavior) | Smooth Corner Patch |
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+------------------------------------------------------------+-------------------------------------------------------------+
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On the left is the legacy behavior of generating sharp corner patches at smooth corners.
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The image on the right shows the correct smooth corner patches generated when this legacy behavior is disabled.
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API Additions
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-------------
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See associated `Doxygen <doxy_html/index.html>`__ for full details.
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Osd::CpuEvaluator, GLComputeEvaluator, etc
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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- Create()
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- EvalStencils()
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- EvalPatches()
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- EvalPatchesVarying()
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- EvalPatchesFaceVarying()
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Osd::Mesh
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~~~~~~~~~
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- Create()
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Osd::MeshBits
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~~~~~~~~~~~~~
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- member MeshUseSmoothCornerPatch
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Far::PatchTableFactory::Options
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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- member generateLegacySharpCornerPatches
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Far::StencilTableFactory
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~~~~~~~~~~~~~~~~~~~~~~~~
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- enumeration Mode::INTERPOLATE_FACE_VARYING
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- AppendLocalPointStencilTableFaceVarying()
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Far::StencilTableFactory::Options
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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- member fvarChannel
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Other Changes
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-------------
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Improvements
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~~~~~~~~~~~~
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- Corrected numerous spelling errors in doxygen comments
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- Updated glFVarViewer with improved error detection and command line parsing
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- Added option to build using MSVC with static CRT
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Bug Fixes
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~~~~~~~~~
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- Fixed a double delete of GL program in Osd::GLComputeEvaluator
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