| 169 | #endif |
| 170 | |
| 171 | pxr::TfToken GetMaterialTag(const pxr::VtDictionary& Metadata, |
| 172 | const pxr::HdMaterialNode2& Terminal) |
| 173 | { |
| 174 | // Strongest materialTag opinion is a hardcoded tag in glslfx meta data. |
| 175 | // This can be used for masked, additive, translucent or volume materials. |
| 176 | // See HdMaterialTagTokens. |
| 177 | pxr::VtValue vtMetaTag = TfMapLookupByValue(Metadata, pxr::HdShaderTokens->materialTag, pxr::VtValue{}); |
| 178 | if (vtMetaTag.IsHolding<std::string>()) |
| 179 | { |
| 180 | return TfToken{vtMetaTag.UncheckedGet<std::string>()}; |
| 181 | } |
| 182 | |
| 183 | // Next check for authored terminal.opacityThreshold value > 0 |
| 184 | for (const auto& param_it : Terminal.parameters) |
| 185 | { |
| 186 | if (param_it.first != HnMaterialPrivateTokens->opacityThreshold) |
| 187 | continue; |
| 188 | |
| 189 | const pxr::VtValue& vtOpacityThreshold = param_it.second; |
| 190 | if (vtOpacityThreshold.Get<float>() > 0.0f) |
| 191 | { |
| 192 | return HnMaterialTagTokens->masked; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | // Next strongest opinion is a connection to 'terminal.opacity' |
| 197 | auto IsTranslucent = (Terminal.inputConnections.find(HnMaterialPrivateTokens->opacity) != Terminal.inputConnections.end()); |
| 198 | |
| 199 | // Weakest opinion is an authored terminal.opacity value. |
| 200 | if (!IsTranslucent) |
| 201 | { |
| 202 | for (const auto& param_it : Terminal.parameters) |
| 203 | { |
| 204 | if (param_it.first != HnMaterialPrivateTokens->opacity) |
| 205 | continue; |
| 206 | |
| 207 | const pxr::VtValue& vtOpacity = param_it.second; |
| 208 | IsTranslucent = vtOpacity.Get<float>() < 1.0f; |
| 209 | break; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | return IsTranslucent ? HnMaterialTagTokens->translucent : HnMaterialTagTokens->defaultTag; |
| 214 | } |
| 215 | |
| 216 | float GetTerminalOpacityThreshold(const pxr::HdMaterialNode2& Terminal) |
| 217 | { |