Method LoadMaterial

IO/Geometry/vtkGLTFDocumentLoaderInternals.cxx:651–766

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//------------------------------------------------------------------------------
bool vtkGLTFDocumentLoaderInternals::LoadMaterial(
  const nlohmann::json& root, vtkGLTFDocumentLoader::Material& material)
{
  double metallicFactor = 1;
  double roughnessFactor = 1;

  const auto& pbrRoot = root.value("pbrMetallicRoughness", nlohmann::json::object());
  if (!pbrRoot.empty())
  {
    if (vtkGLTFUtils::GetDoubleValue(pbrRoot, "metallicFactor", metallicFactor))
    {
      if (metallicFactor < 0 || metallicFactor > 1)
      {
        vtkWarningWithObjectMacro(this->Self,
          "Invalid material.pbrMetallicRoughness.metallicFactor value. Using default "
          "value instead.");
        metallicFactor = 1;
      }
    }
    if (vtkGLTFUtils::GetDoubleValue(pbrRoot, "roughnessFactor", roughnessFactor))
    {
      if (roughnessFactor < 0 || roughnessFactor > 1)
      {
        vtkWarningWithObjectMacro(this->Self,
          "Invalid material.pbrMetallicRoughness.roughnessFactor value. Using default"
          " value instead.");
        roughnessFactor = 1;
      }
    }
    auto pbrRootBaseColorTextureIt = pbrRoot.find("baseColorTexture");
    if (pbrRootBaseColorTextureIt != pbrRoot.end())
    {
      this->LoadTextureInfo(
        pbrRootBaseColorTextureIt.value(), material.PbrMetallicRoughness.BaseColorTexture);
    }
    auto pbrRootMetallicRoughnessTextureIt = pbrRoot.find("metallicRoughnessTexture");
    if (pbrRootMetallicRoughnessTextureIt != pbrRoot.end())
    {
      this->LoadTextureInfo(pbrRootMetallicRoughnessTextureIt.value(),
        material.PbrMetallicRoughness.MetallicRoughnessTexture);
    }
    vtkGLTFUtils::GetDoubleArray(
      pbrRoot, "baseColorFactor", material.PbrMetallicRoughness.BaseColorFactor);
  }
  if (material.PbrMetallicRoughness.BaseColorFactor.size() !=
    vtkGLTFDocumentLoader::GetNumberOfComponentsForType(vtkGLTFDocumentLoader::AccessorType::VEC4))
  {
    material.PbrMetallicRoughness.BaseColorFactor.clear();
  }
  if (material.PbrMetallicRoughness.BaseColorFactor.empty())
  {
    material.PbrMetallicRoughness.BaseColorFactor.insert(
      material.PbrMetallicRoughness.BaseColorFactor.end(), { 1, 1, 1, 1 });
  }
  material.PbrMetallicRoughness.MetallicFactor = metallicFactor;
  material.PbrMetallicRoughness.RoughnessFactor = roughnessFactor;
  auto rootNormalTextureIt = root.find("normalTexture");
  if (rootNormalTextureIt != root.end())