The light refraction effect of the shader is not working.

[Garfield9986]

Description of Issue

When I used usdview to open an asset with a glass material, usdview didn't always display the glass correctly.

Steps to Reproduce

I wanted to refer to the official scene examples "still_life_project_files" and "bar_scene_proxy" to use princopledshader to add refraction to my glass model, but instead when I opened the official scene using usdview, The glass bottle in the scene could not be displayed correctly, and after I set the parameters of the model created by myself and opened it, the model in the usdview scene did not have the effect of glass, but just like the obj model was opened directly in usdview, without coloring. I was very confused. I have consulted the api of princopled shader in Houdini, which has support for physical optical parameters. Does usd not support refraction effects or princopled shader? Or is it because I didn't set the parameters correctly?
Here's what my material says about shaders:

      def Material "principledshader1"
              {
                  token outputs:karma:displacement.connect = 
</imagetostl_mesh/materials/principledshader1/principledshader1_displace.outputs:displacement>
                  token outputs:karma:surface.connect = 
</imagetostl_mesh/materials/principledshader1/principledshader1_surface.outputs:surface>
                  token outputs:surface.connect = 
</imagetostl_mesh/materials/principledshader1/principledshader1_preview.outputs:surface>
      
                  def Shader "principledshader1_surface"
                  {
                      uniform token info:implementationSource = "sourceAsset"
                      uniform asset info:sourceAsset = @opdef:/Vop/principledshader::2.0?SurfaceVexCode@
                      vector3f inputs:basecolor = (1, 1, 1)
                      int inputs:fakecausticsenabled = 1
                      float inputs:rough = 0
                      float inputs:ior = 1.50
                      float inputs:dispersion = 0.40
                      float inputs:transparency = 1
                      token outputs:surface
                  }
      
                  def Shader "principledshader1_displace"
                  {
                      uniform token info:implementationSource = "sourceAsset"
                      uniform asset info:sourceAsset = @opdef:/Vop/principledshader::2.0?DisplacementVexCode@
                      token outputs:displacement
                  }
      
                  def Shader "principledshader1_preview"
                  {
                      uniform token info:id = "UsdPreviewSurface"
                      float inputs:clearcoatRoughness = 0
                      color3f inputs:diffuseColor = (1, 1, 1)
                      float inputs:opacity = 0
                      float inputs:roughness = 0
                      float inputs:ior = 1.50
                      float inputs:dispersion = 0.40
                      color3f inputs:specularColor = (1, 1, 1)
                      token outputs:surface
                  }
              }

System Information (OS, Hardware)

windows10

Package Versions

usd23.11

Build Flags

[jesschimein]

Filed as internal issue #USD-9399

[nvmkuruc]

@Garfield9986, are you using a usdview that ships with Houdini? @marktucker or @chrisrydalch might have some thoughts here.

[marktucker]

Please submit this as a bug to support@sidefx.com (with a hip file ideally, unless the "standard project files" you're referring to came from the SideFX web site or content library?). This is almost certainly not a general USD issue, as you're using karma-specific principled shader, and I presume the USD Preview Surface shader auto-generated by Houdini from the principled shader in the Material Library LOP. It is likely that the specifics of how Houdini is authoring these shaders are the problem here. Thanks!

[nvmkuruc]

Thanks Mark-- @jesschimein Sounds like this can be closed.

[jesschimein]

Thanks all! I'm closing this issue for now; feel free to file a new issue if it turns out there's a USD component to be looked at :)