diff --git a/Rendering/OpenGL2/vtkSSAOPass.cxx b/Rendering/OpenGL2/vtkSSAOPass.cxx
index 98995f6732ddb8f93f7d68e5a6e5814b6b4d274a..6a9b414d74be4c386af7eecd5aeed42809ef6696 100644
--- a/Rendering/OpenGL2/vtkSSAOPass.cxx
+++ b/Rendering/OpenGL2/vtkSSAOPass.cxx
@@ -256,13 +256,28 @@ void vtkSSAOPass::RenderDelegate(const vtkRenderState* s, int w, int h)
   this->FrameBufferObject->AddDepthAttachment(this->DepthTexture);
   this->FrameBufferObject->StartNonOrtho(w, h);
 
+  // Clear color and depth.
+  // This is only required for the vtkRenderer built-in UseSSAO feature
+  // where the DelegatePass does not use a vtkCameraPass for clearing.
   vtkOpenGLRenderer* glRen = vtkOpenGLRenderer::SafeDownCast(s->GetRenderer());
+  if (glRen && glRen->GetUseSSAO() && glRen->GetErase())
+  {
+    vtkOpenGLState* ostate = glRen->GetState();
+    GLbitfield clear_mask = 0;
+    if (!glRen->Transparent())
+    {
+      clear_mask |= GL_COLOR_BUFFER_BIT;
+    }
 
-  vtkOpenGLState* ostate = glRen->GetState();
-  ostate->vtkglClear(GL_COLOR_BUFFER_BIT);
-  ostate->vtkglDepthMask(GL_TRUE);
-  ostate->vtkglClearDepth(1.0);
-  ostate->vtkglClear(GL_DEPTH_BUFFER_BIT);
+    if (!glRen->GetPreserveDepthBuffer())
+    {
+      ostate->vtkglClearDepth(static_cast<GLclampf>(1.0));
+      clear_mask |= GL_DEPTH_BUFFER_BIT;
+      ostate->vtkglDepthMask(GL_TRUE);
+    }
+
+    ostate->vtkglClear(clear_mask);
+  }
 
   this->DelegatePass->Render(s);
   this->NumberOfRenderedProps += this->DelegatePass->GetNumberOfRenderedProps();