Add custom Mitsuba integrator for GNM half-Lambert shading. - #79
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This change introduces GnmHalfLambertIntegrator, a custom Mitsuba integrator that implements a half-Lambert shading model combined with a Cook-Torrance specular lobe. This allows Mitsuba renders to closely match the output of the PyRender-based render_gnm pipeline. The integrator is dynamically registered with Mitsuba via a variant callback. PiperOrigin-RevId: 972526336
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Add custom Mitsuba integrator for GNM half-Lambert shading.
This change introduces GnmHalfLambertIntegrator, a custom Mitsuba integrator that implements a half-Lambert shading model combined with a Cook-Torrance specular lobe. This allows Mitsuba renders to closely match the output of the PyRender-based render_gnm pipeline. The integrator is dynamically registered with Mitsuba via a variant callback.