Merge remote-tracking branch 'origin/5.10' into dev

Change-Id: I2d373d538df3a65ac2d41238e5c6a214a151be68

1 files changed, 12 insertions, 1 deletions

diff --git a/src/render/backend/renderview.cpp b/src/render/backend/renderview.cpp
index 07311824e..bdf7605db 100644
--- a/src/render/backend/renderview.cpp
+++ b/src/render/backend/renderview.cpp
@@ -596,7 +596,12 @@ QVector<RenderCommand *> RenderView::buildDrawRenderCommands(const QVector<Entit
             for (const RenderPassParameterData &passData : renderPassData) {
                 // Add the RenderPass Parameters
                 RenderCommand *command = new RenderCommand();
-                command->m_depth = m_data.m_eyePos.distanceToPoint(entity->worldBoundingVolume()->center());
+
+                // Project the camera-to-object-center vector onto the camera
+                // view vector. This gives a depth value suitable as the key
+                // for BackToFront sorting.
+                command->m_depth = QVector3D::dotProduct(entity->worldBoundingVolume()->center() - m_data.m_eyePos, m_data.m_eyeViewDir);
+
                 command->m_geometry = geometryHandle;
                 command->m_geometryRenderer = geometryRendererHandle;
                 command->m_material = materialHandle;
@@ -754,6 +759,12 @@ void RenderView::updateMatrices()
         const QMatrix4x4 inverseWorldTransform = viewMatrix().inverted();
         const QVector3D eyePosition(inverseWorldTransform.column(3));
         setEyePosition(eyePosition);
+
+        // Get the viewing direction of the camera. Use the normal matrix to
+        // ensure non-uniform scale works too.
+        QMatrix3x3 normalMat = m_data.m_viewMatrix.normalMatrix();
+        // dir = normalize(QVector3D(0, 0, -1) * normalMat)
+        setEyeViewDirection(QVector3D(-normalMat(2, 0), -normalMat(2, 1), -normalMat(2, 2)).normalized());
     }
 }