Function MakeActorMaterial

Rendering/RayTracing/vtkOSPRayPolyDataMapperNode.cxx:676–787

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
OSPMaterial MakeActorMaterial(vtkOSPRayRendererNode* orn, OSPRenderer oRenderer,
  vtkProperty* property, double* ambientColor, double* diffuseColor, float* specularf,
  double opacity, bool pt_avail, bool& useCustomMaterial, std::map<std::string, OSPMaterial>& mats,
  const std::string& materialName)
{
  RTW::Backend* backend = orn->GetBackend();
  useCustomMaterial = false;
  if (backend == nullptr)
  {
    return OSPMaterial();
  }

  float lum = static_cast<float>(vtkOSPRayActorNode::GetLuminosity(property));

  float diffusef[] = { static_cast<float>(diffuseColor[0] * property->GetDiffuse()),
    static_cast<float>(diffuseColor[1] * property->GetDiffuse()),
    static_cast<float>(diffuseColor[2] * property->GetDiffuse()) };
  if (lum > 0.0)
  {
    OSPMaterial oMaterial = vtkOSPRayMaterialHelpers::NewMaterial(orn, oRenderer, "luminous");
    ospSetVec3f(oMaterial, "color", diffusef[0], diffusef[1], diffusef[2]);
    ospSetFloat(oMaterial, "intensity", lum);
    return oMaterial;
  }

  if (pt_avail && property->GetMaterialName())
  {
    if (std::string("Value Indexed") == property->GetMaterialName())
    {
      vtkOSPRayMaterialHelpers::MakeMaterials(
        orn, oRenderer, mats); // todo: do an mtime check to avoid doing this when unchanged
      std::string requested_mat_name = materialName;
      if (!requested_mat_name.empty() && requested_mat_name != "Value Indexed")
      {
        useCustomMaterial = true;
        return vtkOSPRayMaterialHelpers::MakeMaterial(orn, oRenderer, requested_mat_name.c_str());
      }
    }
    else
    {
      useCustomMaterial = true;
      return vtkOSPRayMaterialHelpers::MakeMaterial(orn, oRenderer, property->GetMaterialName());
    }
  }

  OSPMaterial oMaterial;
  if (pt_avail && property->GetInterpolation() == VTK_PBR)
  {
    oMaterial = vtkOSPRayMaterialHelpers::NewMaterial(orn, oRenderer, "principled");

    ospSetVec3f(oMaterial, "baseColor", diffusef[0], diffusef[1], diffusef[2]);
    ospSetFloat(oMaterial, "metallic", static_cast<float>(property->GetMetallic()));
    ospSetFloat(oMaterial, "roughness", static_cast<float>(property->GetRoughness()));
    ospSetFloat(oMaterial, "opacity", static_cast<float>(opacity));
    // As OSPRay seems to not recalculate the refractive index of the base layer
    // we need to recalculate, from the effective reflectance of the base layer (with the
    // coat), the ior of the base that will produce the same reflectance but with the air
    // with an ior of 1.0