test: Add StandardShaderBall test scene and common models directory

src/cmake/testing.cmake

@@ -431,6 +431,7 @@ macro (osl_add_all_tests)
                 render-mx-medium-vdf
                 render-mx-medium-vdf-glass
                 render-microfacet render-oren-nayar
+                render-shaderball
                 render-spi-thinlayer
                 render-uv render-veachmis render-ward
                 render-raytypes

testsuite/common/models/shaderball/README.md

@@ -0,0 +1,26 @@
+<!-- Copyright Contributors to the Open Shading Language project. -->
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
+Standard Shader Ball
+====================
+
+`shaderball.obj` and `shaderball.mtl` are derived from the **StandardShaderBall**
+asset published by the USD Working Group, which is licensed CC-BY-4.0:
+
+  https://github.com/usd-wg/assets/tree/main/full_assets/StandardShaderBall
+
+Credit: Chris Rydalch (geometry and textures), André Mazzone (specification and
+validation), Thomas Anagnostou (original scene and inspiration).
+
+Modifications
+-------------
+
+The original USD asset was imported into Blender 3.4.1 and re-exported as
+Wavefront OBJ + MTL for `testrender`, which triangulates the mesh and drops the
+shading networks. The exported `.mtl` retains the original material names, which
+`testrender` uses to assign OSL shader groups.
+
+Additional geometry in the form of emission planes were added in place of USD area
+lights, which cannot be represented in OBJ format and which `testrender` can not use.
+These are the `emitterTop0` through `emitterTop3` and `emitterLeft0` groups. The
+modeled geometry is otherwise unchanged.

testsuite/common/models/shaderball/shaderball.mtl

@@ -0,0 +1,127 @@
+# StandardShaderBall, from the USD Working Group asset repository:
+# https://github.com/usd-wg/assets/tree/main/full_assets/StandardShaderBall
+# Copyright (c) Chris Rydalch, André Mazzone, Thomas Anagnostou.
+# SPDX-License-Identifier: CC-BY-4.0
+# Converted from USD to OBJ via Blender. See README.md in this directory for details.
+# Blender 3.4.1 MTL File: 'shaderball-light-geo.blend'
+# www.blender.org
+
+newmtl back
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl backplane
+Ns 360.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl emitterLeft
+Ns 360.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl emitterTop
+Ns 360.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl front
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl ground
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl left
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl material_surface
+Ns 360.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl neutral
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl right
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl sss_bars
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl top
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2