<div dir="ltr">Hi Sankhesh,<div><br></div><div>Here's my initialization function and my render function. The external camera set up is highlighted. <br><div><b><br></b></div><div><div><b>vtkNew<ExternalVTKWidget> externalVTKWidget;</b></div><div><b>vtkSmartPointer<vtkRenderer> ren = externalVTKWidget->AddRenderer();</b></div><div><b>static int windowId = -1;</b></div><div><b>static int windowH = 800;</b></div><div><b>static int windowW = 800;</b></div><div><b>vtkSmartPointer<vtkActor> actors[7];</b></div><div><b><br></b></div><div><b>vtkNew<vtkTransform> transform;</b></div><div><b>int press_x, press_y;</b></div><div><b>int release_x, release_y;</b></div><div><b>float x_angle = 0.0;</b></div><div><b>float y_angle = 0.0;</b></div><div><b>float scale_size = 1;</b></div><div><b>int xform_mode = 0;</b></div><div><b>#define XFORM_NONE 0</b></div><div><b>#define XFORM_ROTATE 1</b></div><div><b>#define XFORM_SCALE 2</b></div><div><br></div><div><br></div><div><b>void initialize() {</b></div><div> <b>vtkNew<vtkExternalOpenGLRenderWindow> renWin;</b></div><div><b> externalVTKWidget->SetRenderWindow(renWin.GetPointer());</b></div><div> </div><div> <b>std::string files[7] = {"../data/newsi-ascii.vtk", "../data/newjets-ascii.vtk", "../data/fekcorr-ascii.vtk", "../data/newar-ascii.vtk", "../data/newhetg-ascii.vtk", "../data/newopt-ascii.vtk", "../data/newsi-ascii.vtk"};</b></div><div><b> </b></div><div><b> for(int i = 0; i < 7; i++) {</b></div><div> <b> vtkSmartPointer<vtkPolyDataReader> reader =</b></div><div><b> vtkSmartPointer<vtkPolyDataReader>::New();</b></div><div><b> reader->SetFileName(files[i].c_str());</b></div><div><b> reader->Update();</b></div><div><b> vtkSmartPointer<vtkPolyData> inputPolyData = reader->GetOutput();</b></div><div><b><br></b></div><div><b> vtkSmartPointer<vtkCleanPolyData> clean =</b></div><div><b> vtkSmartPointer<vtkCleanPolyData>::New();</b></div><div><b> clean->SetInputData(inputPolyData);</b></div><div><br></div><div> // Generate normals</div><div> <b>vtkSmartPointer<vtkPolyDataNormals> normals =</b></div><div><b> vtkSmartPointer<vtkPolyDataNormals>::New();</b></div><div><b> normals->SetInputConnection(clean->GetOutputPort());</b></div><div><b> normals->SplittingOff();</b></div><div> </div><div><br></div><div> <b>vtkSmartPointer<vtkPolyDataMapper> mapper =</b></div><div><b> vtkSmartPointer<vtkPolyDataMapper>::New();</b></div><div><b> mapper->SetInputConnection(normals->GetOutputPort());</b></div><div><br></div><div> <b>vtkSmartPointer<vtkActor> actor =</b></div><div><b> vtkSmartPointer<vtkActor>::New();</b></div><div><b> actor->SetMapper(mapper);</b></div><div><b> actor->GetProperty()->SetInterpolationToFlat();</b></div><div><b><br></b></div><div><b> ren->AddActor(actor);</b></div><div><b> actors[i] = actor;</b></div><div><b> }</b></div><div> </div><div> <b>ren->SetBackground(0, 0, 0);</b></div><div><b style="background-color:rgb(255,217,102)"> ren->MakeCamera();</b></div><div><b style="background-color:rgb(255,217,102)"> ren->ResetCamera();</b></div><div><b> renWin->AddRenderer(ren);</b></div><div><b>}</b></div><div><br></div><div>// Render function</div><div><b>void display() {</b></div><div> // Enable depth testing. Demonstrates OpenGL context being managed by external</div><div> // application i.e. GLUT in this case.</div><div> <b>glEnable(GL_DEPTH_TEST);</b></div><div><br></div><div> // Buffers being managed by external application i.e. GLUT in this case.</div><div> <b>glClearColor(0.0f, 0.0f, 0.0f, 1.0f);</b> // Set background color to black and opaque</div><div> <b>glClearDepth(1.0f);</b></div><div> <b>glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);</b> // Clear the color buffer</div><div><br></div><div> <b>glFlush();</b> // Render now</div><div><br></div><div> <b>glEnable(GL_LIGHTING);</b></div><div><b> glEnable(GL_LIGHT0);</b></div><div> </div><div> <b>GLfloat diffuse[] = {1.0f, 1.0f, 1.0f, 1.0f};</b></div><div><b> glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);</b></div><div><b> GLfloat specular[] = {0.5f, 0.0f, 0.0f, 1.0f};</b></div><div><b> glLightfv(GL_LIGHT0, GL_SPECULAR, specular);</b></div><div><b> GLfloat ambient[] = {1.0f, 1.0f, 0.2f, 1.0f};</b></div><div><b> glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);</b></div><div><br></div><div><br></div><div><span style="background-color:rgb(255,217,102)"> <b>vtkExternalOpenGLCamera *camera = (vtkExternalOpenGLCamera *)ren->GetActiveCamera();</b></span></div><div><b style="background-color:rgb(255,217,102)"> camera->SetPosition(0,0,-100);</b></div><div><b style="background-color:rgb(255,217,102)"> camera->SetFocalPoint(0,0,0); </b></div><div><b style="background-color:rgb(255,217,102)"> camera->SetViewUp(0,1,0); </b></div><div><br></div><div> </div><div> <b>for(int i = 0; i < 7; i++) {</b></div><div><b> // transpose - vtk</b></div><div><b> actors[i]->SetOrientation(0,0,0);</b></div><div><b> actors[i]->RotateX(y_angle);</b></div><div><b> actors[i]->RotateY(x_angle);</b></div><div><b> actors[i]->SetScale(scale_size);</b></div><div><b> </b></div><div><b> // transpose - opengl</b></div><div><b> double f[16];</b></div><div><b> actors[i]->GetMatrix(f);</b></div><div><b><br></b></div><div><b> // transpose</b></div><div><b> double g[16];</b></div><div><b> g[0] = f[0]; g[1] = f[4]; g[2] = f[8]; g[3] = f[12];</b></div><div><b> g[4] = f[1]; g[5] = f[5]; g[6] = f[9]; g[7] = f[13];</b></div><div><b> g[8] = f[2]; g[9] = f[6]; g[10]= f[10];g[11]= f[14];</b></div><div><b> g[12]= f[3]; g[13]= f[7]; g[14]= f[11];g[15]= f[15];</b></div><div><b> glMultMatrixd(g); // multiply current matrix with specified matrix</b></div><div><b> }</b></div><div><br></div><div> <b>externalVTKWidget->GetRenderWindow()->Render();</b></div><div><b> glutSwapBuffers();</b></div><div><b>}</b></div></div></div><div><b><br></b></div><div>Thanks,</div><div>Elaine</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 20, 2017 at 1:11 PM, Sankhesh Jhaveri <span dir="ltr"><<a href="mailto:sankhesh.jhaveri@kitware.com" target="_blank">sankhesh.jhaveri@kitware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="m_-8095862806611381565markdown-here-wrapper" style="font-family:'Lucida Sans',Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi Elaine,</p>
<p style="margin:0px 0px 1.2em!important">You shouldn’t have to set that flag for using the matrices set on the external camera. Could you share some sample code that doesn’t work?</p>
<p style="margin:0px 0px 1.2em!important">Thanks,<br>Sankhesh</p>
<div title="MDH:SGkgRWxhaW5lLDxkaXY+PGJyPjwvZGl2PjxkaXY+WW91IHNob3VsZG4ndCBoYXZlIHRvIHNldCB0
aGF0IGZsYWcgZm9yIHVzaW5nIHRoZSBtYXRyaWNlcyBzZXQgb24gdGhlIGV4dGVybmFsIGNhbWVy
YS4gQ291bGQgeW91IHNoYXJlIHNvbWUgc2FtcGxlIGNvZGUgdGhhdCBkb2Vzbid0IHdvcms/PC9k
aXY+PGRpdj48YnI+PC9kaXY+PGRpdj5UaGFua3MsPC9kaXY+PGRpdj5TYW5raGVzaDwvZGl2Pg==" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0"></div></div></div><div class="HOEnZb"><div class="h5"><br><div class="gmail_quote"><div dir="ltr">On Thu, Jul 20, 2017 at 11:38 AM Elaine Jiang <<a href="mailto:elainejiang8@gmail.com" target="_blank">elainejiang8@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Sankhesh,<div><br></div><div>I've tried setting the camera and focal point parameters without using SetProjectionMatrix() and SetModelViewTransformMatrix(), and I've also tried just calling SetProjectionMatrix() and SetModelViewTransformMatrix() by themselves. Neither approach seemed to have an effect on the scene. I was looking through the documentation and was wondering if I need to use the function vtkCamera::<wbr>vtkSetUseExplicitProjectionTra<wbr>nsformMatrix(bool) to solve the problem?</div><div><br></div><div>Thanks,</div><div>Elaine</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 20, 2017 at 11:12 AM, Sankhesh Jhaveri <span dir="ltr"><<a href="mailto:sankhesh.jhaveri@kitware.com" target="_blank">sankhesh.jhaveri@kitware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="m_-8095862806611381565m_-7939614205799474427m_-7741260002236855523m_231165425845248325markdown-here-wrapper" style="font-family:'Lucida Sans',Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi,</p>
<p style="margin:0px 0px 1.2em!important">Could you please provide more details on how you’re trying to set the camera parameters?<br>The way the external camera works is that it ignores the camera position and focal point parameters if the projection and model view matrices are set explicitly using <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;display:inline">vtkExternalOpenGLCamera::<wbr>SetProjectionMatrix()</code> and <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;display:inline">vtkExternalOpenGLCamera::<wbr>SetModelViewTransformMatrix()</code></p>
<p style="margin:0px 0px 1.2em!important">Thanks,<br>Sankhesh</p>
<div title="MDH:SGksPGRpdj48YnI+PC9kaXY+PGRpdj5Db3VsZCB5b3UgcGxlYXNlIHByb3ZpZGUgbW9yZSBkZXRh
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aDwvZGl2Pg==" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0"></div></div><div><div class="m_-8095862806611381565m_-7939614205799474427h5"><br><div class="gmail_quote"><div dir="ltr">On Wed, Jul 19, 2017 at 9:59 AM elainejiang8 <<a href="mailto:elainejiang8@gmail.com" target="_blank">elainejiang8@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi everyone!<br>
<br>
I'm building a program that uses the externalVTKWidget to volume render an<br>
object in an OpenGL context. Right now, I'm calling<br>
<br>
*ren->GetActiveCamera();<br>
*<br>
<br>
(where ren is a vtkExternalOpenGLRenderWindow instance) in my render<br>
function so I can control the position and focal point of the camera.<br>
However, I'm unable to get the camera to actually have any effect on the<br>
scene. The documentation for vtkExternalOpenGLCamera is rather slim, and I<br>
can't find any similar examples, so I am a bit stuck on this issue.<br>
<br>
Does anyone have any insight into how I could approach this problem? Thanks<br>
in advance!<br>
<br>
Elaine<br>
<br>
<br>
<br>
--<br>
View this message in context: <a href="http://vtk.1045678.n5.nabble.com/Using-vtkExternalOpenGLCamera-tp5744015.html" rel="noreferrer" target="_blank">http://vtk.1045678.n5.nabble.<wbr>com/Using-<wbr>vtkExternalOpenGLCamera-<wbr>tp5744015.html</a><br>
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</blockquote></div></div></div></div><span class="m_-8095862806611381565m_-7939614205799474427HOEnZb"><font color="#888888"><div dir="ltr">-- <br></div><div class="m_-8095862806611381565m_-7939614205799474427m_-7741260002236855523gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div class="m_-8095862806611381565m_-7939614205799474427m_-7741260002236855523inbox-markdown-here-wrapper" style="font-family:'proza libre',sans-serif;color:rgb(0,56,107)"><h5 id="m_-8095862806611381565m_-7939614205799474427m_-7741260002236855523inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)">Sankhesh Jhaveri</h5>
<h6 id="m_-8095862806611381565m_-7939614205799474427m_-7741260002236855523inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:'open sans',sans-serif;font-weight:normal"><em>Sr. Research & Development Engineer</em> | <a href="http://www.kitware.com/" target="_blank">Kitware</a> | <a href="tel:(518)%20881-4417" value="+15188814417" target="_blank">(518) 881-4417</a></h6>
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</font></span></blockquote></div><br></div>
</blockquote></div><div dir="ltr">-- <br></div><div class="m_-8095862806611381565gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div class="m_-8095862806611381565inbox-markdown-here-wrapper" style="font-family:'proza libre',sans-serif;color:rgb(0,56,107)"><h5 id="m_-8095862806611381565inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)">Sankhesh Jhaveri</h5>
<h6 id="m_-8095862806611381565inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:'open sans',sans-serif;font-weight:normal"><em>Sr. Research & Development Engineer</em> | <a href="http://www.kitware.com/" target="_blank">Kitware</a> | <a href="tel:(518)%20881-4417" value="+15188814417" target="_blank">(518) 881-4417</a></h6>
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</div></div></blockquote></div><br></div>