<div dir="ltr">Hi Torsten,<div><br></div><div>I suspect that it will work if you do this:</div><div><br></div><div><div> this->Transform->Identity();</div><div> this->Transform->Concatenate(eyeToWorld->GetMatrix());</div><div> this->Transform->Inverse();</div><div><br></div><div>The "Concatenate" method has two signatures with different behavior:</div><div> Concatenate(vtkMatrix4x4 *)</div><div> Concatenate(vtkTransform *)</div><div><br></div><div>The second one establishes a connection between the two transforms,</div><div>so if you do "this->Transform->Concatenate(eyeToWorld)" then any</div><div>future changes to "eyeToWorld" will also cause "this->Transform" to</div><div>change.</div><div><br></div><div>If you call "this->Transform->Update()" before PrintSelf, is the correct</div><div>matrix printed? The TransformVector() method implicitly calls Update().</div><div><br></div><div> - David </div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 21, 2016 at 9:28 AM, Torsten Sadowski <span dir="ltr"><<a href="mailto:torsten.sadowski@windnovation.com" target="_blank">torsten.sadowski@windnovation.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Hello,<br>
<br>
I am trying to design my own vtkTDxInteractorStyle. When I looked
into vtkTDxInteractorStyleCamera as an example I found something
puzzling which might be a bug in either vtkTransform or
vtkTDxInteractorStyleCamera.<br>
<br>
This snippet from <span style="color:rgb(128,128,0)">void</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vtkTDxInteractorStyleCamera</span><span style="color:rgb(0,0,0)">::</span><span style="font-style:italic;color:rgb(0,0,0)">OnMotionEvent<br>
<br>
</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">//</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">Get</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">the</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">rotation</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">axis</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">in</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">world</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">coordinates.</span>
<pre style="margin:0px;text-indent:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">Identity</span><span style="color:rgb(0,0,0)">();</span></pre>
<pre style="margin:0px;text-indent:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">Concatenate</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">eyeToWorld</span><span style="color:rgb(0,0,0)">);</span></pre>
<pre style="margin:0px;text-indent:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="font-style:italic;color:rgb(0,0,0)">Inverse</span><span style="color:rgb(0,0,0)">();</span></pre>
<pre style="margin:0px;text-indent:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">TransformVector</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">axisEye</span><span style="color:rgb(0,0,0)">,</span><span style="color:rgb(0,0,0)">axisWorld</span><span style="color:rgb(0,0,0)">);</span></pre>
<pre style="margin:0px;text-indent:0px">does nothing useful because the Transform returns the identity after Inverse (checked with PrintSelf).
This on the other hand works:
<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">//</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">Get</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">the</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">rotation</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">axis</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">in</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">world</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">coordinates.</span>
<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">SetMatrix</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">eyeToWorld</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">GetMatrix</span><span style="color:rgb(0,0,0)">());</span>
<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="font-style:italic;color:rgb(0,0,0)">Inverse</span><span style="color:rgb(0,0,0)">();</span>
<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(128,0,0)">Transform</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">TransformVector</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">axisEye</span><span style="color:rgb(0,0,0)">,</span><span style="color:rgb(0,0,0)">axisWorld</span><span style="color:rgb(0,0,0)">);</span>
I'm baffled.
Best Regards,
Torsten Sadowski
</pre>
<br>
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<div>Dr.-Ing. Torsten Sadowski<br>
Turbine Design/System Integration<br>
<br>
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