Merge pull request #12385 from CesiumGS/depth-plane-precision

lukemckinstry · web-flow · commit 6d02388c2fab · 2024-12-20T16:23:56.000Z
Fix intermittent z-fighting issue in DepthPlaneVS
diff --git a/CHANGES.md b/CHANGES.md
@@ -5,6 +5,7 @@
 ##### Fixes :wrench:
 
 - Fixed JulianDate to always generate valid ISO strings for fractional milliseconds [#12345](https://github.com/CesiumGS/cesium/pull/12345)
+- Fixed intermittent z-fighting issue. [#12337](https://github.com/CesiumGS/cesium/issues/12337)
 
 ### 1.124 - 2024-12-02
 
diff --git a/packages/engine/Source/Shaders/DepthPlaneVS.glsl b/packages/engine/Source/Shaders/DepthPlaneVS.glsl
@@ -5,7 +5,7 @@ out vec4 positionEC;
 void main()
 {
     positionEC = czm_modelView * position;
-    gl_Position = czm_modelViewProjection * position;
+    gl_Position = czm_projection * positionEC;
 
     czm_vertexLogDepth();
 }

Original file line number	Diff line number	Diff line change
`@@ -5,7 +5,7 @@ out vec4 positionEC;`
`5`	`5`	`void main()`
`6`	`6`	`{`
`7`	`7`	`positionEC = czm_modelView * position;`
`8`		`- gl_Position = czm_modelViewProjection * position;`
	`8`	`+ gl_Position = czm_projection * positionEC;`
`9`	`9`
`10`	`10`	`czm_vertexLogDepth();`
`11`	`11`	`}`