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I'm trying to transform a 3Dpoint in my drawing to a point in the screen, intuitively I would multiply with a (VW)TransformMatrix that should be easy to retrieve.

I tried this:

VWTransformMatrix viewMatrix;

This line returns a empty (identity) matrix, even when i'm not in top view.

I'm using an isometric perspective.

What could I be doing wrong?

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Try to use TransformMatrix directly for the call as specified by http://developer.vectorworks.net/index.php/VCOM:VectorWorks:ISDK::GetViewMatrix


Something like:

TransformMatrix rawViewMatrix;

// If needed, you can still make something like this afterwards:
VWTransformMatrix viewMAtrix = rawViewMatrix;



Edited by Nicolas Goutte
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Thank you,

This works, but i would  like to understand he story behind TransformMatrix and VWTransformMatrix.

What's compatible and what is not?

Edited by Nebeor

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When you take the reference of VWTransformMatrix, you get the reference of a TransformMatrix that is inside VWTransformMatrix (to be exact: VWTransformMatrix::fMatrix). This matrix does get the correct value by the call gSDK->GetViewMatrix but this good matrix  is never transferred to the main matrix data of VWTransformMatrix (to be exact: VWTransformMatrix::m). That is why you still get the identity matrix.


So you have to explicitly set a TransformMatrix to the VWTransformMatrix to have what you want.


This behavior was changed already in VWSDK 2016. From 2016 on, there is no "double bookkeeping" any more in the class.

Edited by Nicolas Goutte

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