Ensure options attributes are not set while a render is in progress #2075 (#2076)

Author: sebastienblor

CHANGELOG.md

@@ -2,10 +2,13 @@
 # Changelog
 
 ## Pending next bugfix release
+- [usd#2075](https://github.com/Autodesk/arnold-usd/issues/2075) - Ensure options attributes are not set while a hydra render is in progress
+
+## [7.3.3.1] - 2024-08-09
 - [usd#1989](https://github.com/Autodesk/arnold-usd/issues/1989) - Support mixed half/float channels when using the render delegate in batch mode with husk.
 - [usd#1610](https://github.com/Autodesk/arnold-usd/issues/1610) - Proper support of arnold:visibility primvar in hydra
 
-## Pending feature release
+## [7.3.3.0] - 2024-07-26
 
 ### Feature
 - [usd#1814](https://github.com/Autodesk/arnold-usd/issues/1814) - Support skinning on USD curves and points

libs/render_delegate/render_delegate.cpp

@@ -1620,8 +1620,11 @@ bool HdArnoldRenderDelegate::ShouldSkipIteration(HdRenderIndex* renderIndex, con
             }
         }
     }
-    if (!skip)
-        ProcessConnections();
+
+    // If we have connections in our stack, it means that some nodes were re-exported, 
+    // and therefore that the render was already interrupted
+    ProcessConnections();
+
     return skip;
 }
 

libs/render_delegate/render_pass.cpp

@@ -569,7 +569,11 @@ void HdArnoldRenderPass::_Execute(const HdRenderPassStateSharedPtr& renderPassSt
             _windowNDC = GfVec4f(0.f, 0.f, 1.f, 1.f);
         }
     }
-    AiNodeSetFlt(options, str::pixel_aspect_ratio, pixelAspectRatio);
+    float currentPixelAspectRatio = AiNodeGetFlt(options, str::pixel_aspect_ratio);
+    if (!GfIsClose(currentPixelAspectRatio, pixelAspectRatio, AI_EPSILON)) {
+        renderParam->Interrupt(true, false);
+        AiNodeSetFlt(options, str::pixel_aspect_ratio, pixelAspectRatio);
+    }    
 
     auto checkShader = [&] (AtNode* shader, const AtString& paramName) {
         auto* options = _renderDelegate->GetOptions();
@@ -597,10 +601,11 @@ void HdArnoldRenderPass::_Execute(const HdRenderPassStateSharedPtr& renderPassSt
 
     // Eventually set the subdiv dicing camera in the options
     const AtNode *subdivDicingCamera = _renderDelegate->GetSubdivDicingCamera(GetRenderIndex());
-    if (subdivDicingCamera)
+    const AtNode *currentSubdivDicingCamera = (const AtNode*)AiNodeGetPtr(options, str::subdiv_dicing_camera);
+    if (currentSubdivDicingCamera != subdivDicingCamera) {
+        renderParam->Interrupt(true, false);
         AiNodeSetPtr(options, str::subdiv_dicing_camera, (void*)subdivDicingCamera);
-    else
-        AiNodeResetParameter(options, str::subdiv_dicing_camera);
+    }
 
     // We are checking if the current aov bindings match the ones we already created, if not,
     // then rebuild the driver setup.