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Hi, all,

I have problems with transformation matrices in DGDK.NET .
Let's say I want to rotate on itself an object with world coordinates stored in a 3D structure (P) and using rotation angles stored in another 3D structure (TR1). Here is the code:

With oDBMath
.RotateYPRMatrix4(Matrix, TR1.AY, TR1.AX, TR1.AZ)
.SetVector3(Vector1, P.X, P.Y, P.Z)
.TransformCoordsVector3(Vector2, Vector1, Mat)
P.X = .XVector3(Vector2)
P.Y = .YVector3(Vector2)
P.Z = .ZVector3(Vector2)
End With

Whatever values are stored in P and TR1, P's all three coordinates are always set to zero! How come? Something escapes me, but what? I have tried with Vector4s having W set to 1.0, same thing.
Thanks,
Thierry

You are using different matrix than which you are actually setting up

.RotateYPRMatrix4(Matrix, TR1.AY, TR1.AX, TR1.AZ)
.TransformCoordsVector3(Vector2, Vector1, Mat)

Oh, my God! I've been making an ass of myself again!
Actually that code comes from a Sub, and Matrix and Mat have the same value (default parameters, you know).
Sorry about that; my question still stands.
Thierry