How to Retrieve View Matrix or Camera Position Using Creo Toolkit?

Hi, 

Below are the .NET API methods to get matrix from model & drawing views.

_____Get Matrix from model View____

public double[] GetMatrix(IpfcView modelView)
{
double[] viewMatrix = new double[9];

//Get View Tranformation

IpfcTransform3D ipfcTransform3D = modelView.Transform;

//Get Matrix from Transformation

CpfcMatrix3D matrix3D1 = ipfcTransform3D.Matrix;

//Normalize the matrix

IpfcMatrix3D matrix3D = Utility.NormalizeMatrix(matrix3D1);

viewMatrix[0] = matrix3D[0, 0];
viewMatrix[1] = matrix3D[0, 1];
viewMatrix[2] = matrix3D[0, 2];
viewMatrix[3] = matrix3D[1, 0];
viewMatrix[4] = matrix3D[1, 1];
viewMatrix[5] = matrix3D[1, 2];
viewMatrix[6] = matrix3D[2, 0];
viewMatrix[7] = matrix3D[2, 1];
viewMatrix[8] = matrix3D[2, 2];

return viewMatrix;
}

_____Get Matrix from drawing View____

public double[] GetMatrix(IpfcView2D inputView2D)
{
double[] viewMatrix = new double[9];

//Get View Tranformation
IpfcTransform3D ipfcTransform3D = inputView2D.GetTransform();

//Get Matrix from Transformation
CpfcMatrix3D matrix3D1 = ipfcTransform3D.Matrix;

//Normalize the matrix
IpfcMatrix3D matrix3D = Utility.NormalizeMatrix(matrix3D1);

viewMatrix[0] = matrix3D[0, 0];
viewMatrix[1] = matrix3D[0, 1];
viewMatrix[2] = matrix3D[0, 2];
viewMatrix[3] = matrix3D[1, 0];
viewMatrix[4] = matrix3D[1, 1];
viewMatrix[5] = matrix3D[1, 2];
viewMatrix[6] = matrix3D[2, 0];
viewMatrix[7] = matrix3D[2, 1];
viewMatrix[8] = matrix3D[2, 2];

return viewMatrix;
}

Procedure is similar for .NET API or Toolkit C++.  Get Matrix from Transformation will always return a 4x4 transformation matrix that include rotation, translation, scaling, and perspective projection.

You won't get values in screen coordinates, the thing you must do is Normalize the matrix.
In the above codes, I am returning only 3x3 matrix for a specific purpose after normalizing the matrix.

Thanks,

Gopinadh Gvs.

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