fix #5057 (broken in d92b319; IsIdentity returns 0 when true)

rts/Rendering/Models/3DModel.h

@@ -155,7 +155,7 @@ struct S3DModelPiece {
 	void SetModelMatrix(const CMatrix44f& m) {
 		// assimp only
 		bakedRotMatrix = m;
-		hasIdentityRot = m.IsIdentity();
+		hasIdentityRot = (m.IsIdentity() == 0);
 		assert(m.IsOrthoNormal() == 0);
 	}
 

rts/Rendering/Models/AssParser.cpp

@@ -1,7 +1,6 @@
 /* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
 
 #include "AssParser.h"
-
 #include "3DModel.h"
 #include "3DModelLog.h"
 #include "AssIO.h"
@@ -286,7 +285,8 @@ void CAssParser::LoadPieceTransformations(
 	const aiNode* pieceNode,
 	const LuaTable& pieceTable
 ) {
-	aiVector3D aiScaleVec, aiTransVec;
+	aiVector3D aiScaleVec;
+	aiVector3D aiTransVec;
 	aiQuaternion aiRotateQuat;
 
 	// process transforms
@@ -316,7 +316,7 @@ void CAssParser::LoadPieceTransformations(
 	//   together with the (baked) aiRotateQuad they determine the
 	//   model's pose *before* any animations execute
 	//
-	// float3 rotAngles = pieceTable.GetFloat3("rotate", aiQuaternionToRadianAngles(aiRotateQuat) * RADTODEG);
+	// float3 pieceRotAngles = pieceTable.GetFloat3("rotate", aiQuaternionToRadianAngles(aiRotateQuat) * RADTODEG);
 	float3 pieceRotAngles = pieceTable.GetFloat3("rotate", ZeroVector);
 
 	pieceRotAngles.x = pieceTable.GetFloat("rotatex", pieceRotAngles.x);
@@ -340,20 +340,22 @@ void CAssParser::LoadPieceTransformations(
 	);
 
 	// NOTE:
-	//   at least collada (.dae) files generated by Blender represent
-	//   a coordinate-system that differs from the "standard" formats
-	//   (3DO, S3O, ...) for which existing tools at least have prior
-	//   knowledge of Spring's expectations --> let the user override
-	//   the ROOT rotational transform and the rotation-axis mapping
-	//   used by animation scripts (but re-modelling/re-exporting is
-	//   always preferred!) even though AssImp should convert models
-	//   to its own system which matches that of Spring
+	//   at least collada (.dae) files generated by Blender are stored
+	//   in a coordinate-system that differs from the standard formats
+	//   (3DO, S3O, ...) for which existing tools have prior knowledge
+	//   of Spring's convention, but AssImp's internal system happens
+	//   to match our own so we need no explicit conversion
+	//
+	//   we allow overriding the (baked) ROOT rotational transform and
+	//   the rotation-axis mapping used by animation scripts because it
+	//   can be a benefit to create models wrt. a different orientation
+	//   than that of the 3D editor (but re-modelling / re-exporting is
+	//   always preferred!)
 	//
 	//   .dae  : x=Rgt, y=-Fwd, z= Up, as=(-1, -1, 1), am=AXIS_XZY (if Z_UP)
 	//   .dae  : x=Rgt, y=-Fwd, z= Up, as=(-1, -1, 1), am=AXIS_XZY (if Y_UP) [!?]
 	//   .blend: ????
-	CMatrix44f bakedMatrix;
-	bakedMatrix = aiMatrixToMatrix(aiMatrix4x4t<float>(aiRotateQuat.GetMatrix()));
+	CMatrix44f bakedMatrix = aiMatrixToMatrix(aiMatrix4x4t<float>(aiRotateQuat.GetMatrix()));
 
 	if (piece == model->GetRootPiece()) {
 		const float3 xaxis = pieceTable.GetFloat3("xaxis", bakedMatrix.GetX());