<div dir="ltr"><div class="markdown-here-wrapper" style="font-family:Verdana,Arial,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi Willy,</p>
<p style="margin:0px 0px 1.2em!important">You need to call <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-radius:3px;display:inline">Modified()</code> on the vtkImageData, each time you update it, for the volume mapper to reload the volume.</p>
<p style="margin:0px 0px 1.2em!important">Hope that helps.</p>
<p style="margin:0px 0px 1.2em!important">Sankhesh</p>
<div title="MDH:SGkgV2lsbHksPGRpdj48YnI+PC9kaXY+PGRpdj5Zb3UgbmVlZCB0byBjYWxsIGBNb2RpZmllZCgp
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dj4=" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">​</div></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Feb 13, 2017 at 8:42 AM Willy <<a href="mailto:Wiggerl@linhuber.info">Wiggerl@linhuber.info</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks for your reply, but i think i described my problem not detailed<br class="gmail_msg">
enough.<br class="gmail_msg">
<br class="gmail_msg">
I don't use vtkRenderWindowInteractor. I have a .NET project with .Net<br class="gmail_msg">
PictureBox in it and a C++ Project witch encapsulates all the vtk stuff. To<br class="gmail_msg">
show the rendered vtk image in my picturebox i set my vtkRenderWindow to<br class="gmail_msg">
OffScreenRenderingOn() and use the following method to Convert vtkImageData<br class="gmail_msg">
to a .NET Bitmap:<br class="gmail_msg">
<br class="gmail_msg">
void VolumeRenderer::Render3DImage(int width, int height, Bitmap^% image)<br class="gmail_msg">
{<br class="gmail_msg">
    _RenderWindow->SetSize(width, height);<br class="gmail_msg">
    _CurrentRenderer->ResetCameraClippingRange();<br class="gmail_msg">
    vtkRenderLargeImage* imageFilter = vtkRenderLargeImage::New();<br class="gmail_msg">
    imageFilter->SetInput(_CurrentRenderer);<br class="gmail_msg">
    imageFilter->SetMagnification(1);<br class="gmail_msg">
    imageFilter->Update();<br class="gmail_msg">
    ConvertRGBVTKImageToBitmap(imageFilter->GetOutput(), image);<br class="gmail_msg">
    imageFilter->Delete();<br class="gmail_msg">
}<br class="gmail_msg">
<br class="gmail_msg">
Each time the user moves the mouse, changes the color, ... i change the<br class="gmail_msg">
Position/Rotation of the camera or the vtkColorTransferFunction or wathever.<br class="gmail_msg">
And after that i recall Render3DImage to get the new Picture which i show in<br class="gmail_msg">
my PictureBox. After the very first call of Render3DImage the rendered image<br class="gmail_msg">
does not change anymore if i change the data in my vtkImageData (using<br class="gmail_msg">
memcpy). i guess that the very first call of Render3DImage copies my<br class="gmail_msg">
cpu-Memory (where vtkImageData is) to the gpu. If a change the vtkImageData<br class="gmail_msg">
after that it does not affect the gpu-memory.<br class="gmail_msg">
Am i rigth? what can i do?<br class="gmail_msg">
<br class="gmail_msg">
<br class="gmail_msg">
<br class="gmail_msg">
--<br class="gmail_msg">
View this message in context: <a href="http://vtk.1045678.n5.nabble.com/vtkGPUVolumeRayCastMapper-Updateing-ImageData-after-first-Rendering-tp5742153p5742159.html" rel="noreferrer" class="gmail_msg" target="_blank">http://vtk.1045678.n5.nabble.com/vtkGPUVolumeRayCastMapper-Updateing-ImageData-after-first-Rendering-tp5742153p5742159.html</a><br class="gmail_msg">
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</blockquote></div><div dir="ltr">-- <br></div><div data-smartmail="gmail_signature"><div dir="ltr"><div class="inbox-markdown-here-wrapper" style="font-family:'proza libre',sans-serif;color:rgb(0,56,107)"><h5 id="inbox-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="inbox--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/">Kitware</a> | (518) 881-4417</h6>
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