diff --git a/src/rendering/hwrenderer/doom_levelsubmesh.cpp b/src/rendering/hwrenderer/doom_levelsubmesh.cpp
index 7035035a0..d3ae35c44 100644
--- a/src/rendering/hwrenderer/doom_levelsubmesh.cpp
+++ b/src/rendering/hwrenderer/doom_levelsubmesh.cpp
@@ -16,9 +16,6 @@
 #include "hwrenderer/scene/hw_flatdispatcher.h"
 #include "common/rendering/hwrenderer/data/hw_meshbuilder.h"
 
-VSMatrix GetPlaneTextureRotationMatrix(FGameTexture* gltexture, const sector_t* sector, int plane);
-void GetTexCoordInfo(FGameTexture* tex, FTexCoordInfo* tci, side_t* side, int texpos);
-
 EXTERN_CVAR(Float, lm_scale);
 
 DoomLevelSubmesh::DoomLevelSubmesh(DoomLevelMesh* mesh, FLevelLocals& doomMap, bool staticMesh) : LevelMesh(mesh), StaticMesh(staticMesh)
@@ -621,22 +618,6 @@ void DoomLevelSubmesh::SetSideLightmap(DoomLevelMeshSurface* surface)
 	}
 }
 
-bool DoomLevelSubmesh::IsDegenerate(const FVector3 &v0, const FVector3 &v1, const FVector3 &v2)
-{
-	// A degenerate triangle has a zero cross product for two of its sides.
-	float ax = v1.X - v0.X;
-	float ay = v1.Y - v0.Y;
-	float az = v1.Z - v0.Z;
-	float bx = v2.X - v0.X;
-	float by = v2.Y - v0.Y;
-	float bz = v2.Z - v0.Z;
-	float crossx = ay * bz - az * by;
-	float crossy = az * bx - ax * bz;
-	float crossz = ax * by - ay * bx;
-	float crosslengthsqr = crossx * crossx + crossy * crossy + crossz * crossz;
-	return crosslengthsqr <= 1.e-6f;
-}
-
 void DoomLevelSubmesh::PackLightmapAtlas(FLevelLocals& doomMap, int lightmapStartIndex)
 {
 	std::vector<LightmapTile*> sortedTiles;
diff --git a/src/rendering/hwrenderer/doom_levelsubmesh.h b/src/rendering/hwrenderer/doom_levelsubmesh.h
index 798cd5c2f..bebf1d388 100644
--- a/src/rendering/hwrenderer/doom_levelsubmesh.h
+++ b/src/rendering/hwrenderer/doom_levelsubmesh.h
@@ -103,8 +103,6 @@ private:
 	int AddSurfaceToTile(const DoomLevelMeshSurface& surf, std::map<LightmapTileBinding, int>& bindings);
 	int GetSampleDimension(const DoomLevelMeshSurface& surf);
 
-	static bool IsDegenerate(const FVector3& v0, const FVector3& v1, const FVector3& v2);
-
 	static FVector2 ToFVector2(const DVector2& v) { return FVector2((float)v.X, (float)v.Y); }
 	static FVector3 ToFVector3(const DVector3& v) { return FVector3((float)v.X, (float)v.Y, (float)v.Z); }
 	static FVector4 ToFVector4(const DVector4& v) { return FVector4((float)v.X, (float)v.Y, (float)v.Z, (float)v.W); }