# OSPRay + OptiX shaders

**URL:** https://discourse.paraview.org/t/ospray-optix-shaders/14997
**Category:** ParaView Support
**Created:** [July 5, 2024, 5:23pm UTC](https://discourse.paraview.org/t/ospray-optix-shaders/14997 "2024-07-05T17:23:44Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![shawn](https://discourse.paraview.org/user_avatar/discourse.paraview.org/shawn/32/14557_2.png) [@shawn](https://discourse.paraview.org/u/shawn)
#### Post date: [July 5, 2024, 5:23pm UTC](https://discourse.paraview.org/t/ospray-optix-shaders/14997/1 "2024-07-05T17:23:44Z")

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Hey all,

Just wondering if OSPRay and OptiX uses their own default shaders or do they still use the same shaders from VTK. I am trying to do a shader replacement while having ray tracing on however, it does not work leading me to believe that the back ends are using a different set of default shaders.

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### Author: ![Sankhesh\_Jhaveri](https://discourse.paraview.org/user_avatar/discourse.paraview.org/sankhesh_jhaveri/32/3374_2.png) [@Sankhesh\_Jhaveri](https://discourse.paraview.org/u/Sankhesh_Jhaveri)
#### Post date: [July 5, 2024, 9:59pm UTC](https://discourse.paraview.org/t/ospray-optix-shaders/14997/2 "2024-07-05T21:59:06Z")

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Yes, they use their own ray-tracing engine to create the final rendered image. The OpenGL (GLSL) shader substitutions in VTK will be ignored by OSPRay and OptiX.