Fixed #1168.

Author: bryanedds

Nu/Nu/OpenGL/OpenGL.PhysicallyBased.fs

@@ -3757,7 +3757,6 @@ module PhysicallyBased =
          lightShadowSampleScalar : single,
          lightShadowExponent : single,
          lightShadowDensity : single,
-         elementsCount : int,
          materials : PhysicallyBasedMaterial array,
          geometry : PhysicallyBasedGeometry,
          shader : PhysicallyBasedDeferredTerrainShader,
@@ -3833,7 +3832,7 @@ module PhysicallyBased =
         Hl.Assert ()
 
         // draw geometry
-        Gl.DrawElements (geometry.PrimitiveType, elementsCount, DrawElementsType.UnsignedInt, nativeint 0)
+        Gl.DrawElements (geometry.PrimitiveType, geometry.ElementCount, DrawElementsType.UnsignedInt, nativeint 0)
         Hl.ReportDrawCall 1
         Hl.Assert ()
 

Nu/Nu/Render/Renderer3d.fs

@@ -3102,9 +3102,7 @@ type [<ReferenceEquality>] GlRenderer3d =
     static member private renderPhysicallyBasedTerrain
         viewArray projectionArray viewProjectionArray eyeCenter
         lightShadowSamples lightShadowBias lightShadowSampleScalar lightShadowExponent lightShadowDensity
-        terrainDescriptor geometry shader vao renderer =
-        let (resolutionX, resolutionY) = Option.defaultValue (0, 0) (GlRenderer3d.tryGetHeightMapResolution terrainDescriptor.HeightMap renderer)                
-        let elementsCount = dec resolutionX * dec resolutionY * 6
+        (terrainDescriptor : TerrainDescriptor) geometry shader vao renderer =
         let terrainMaterialProperties = terrainDescriptor.MaterialProperties
         let materialProperties : OpenGL.PhysicallyBased.PhysicallyBasedMaterialProperties =
             { Albedo = Option.defaultValue Constants.Render.AlbedoDefault terrainMaterialProperties.AlbedoOpt
@@ -3221,7 +3219,7 @@ type [<ReferenceEquality>] GlRenderer3d =
         OpenGL.PhysicallyBased.DrawPhysicallyBasedTerrain
             (viewArray, projectionArray, viewProjectionArray, eyeCenter,
              instanceFields, lightShadowSamples, lightShadowBias, lightShadowSampleScalar, lightShadowExponent, lightShadowDensity,
-             elementsCount, materials, geometry, shader, vao)
+             materials, geometry, shader, vao)
 
     static member private renderShadow
         lightOrigin