[vtkusers] Drawing half a million "vtkParametricEllipsoid"s

[David E DeMarle]

vtkGlyph3D will be more efficient. vtkGlyph3DMapper will be still more
efficient.

The concept you want is to define a single data set with points at the
locations where you want the elipsoids and the rotation matrices encoded
into a vector field on those locations, then apply either glypher to place
and orient a single ellipsoid instance onto that data set.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Wed, May 22, 2013 at 8:56 AM, VoodooCode <MaxSchererMax at gmail.com> wrote:

> Hi,
>
> I want to draw half a million ellipsoids, all defined by their radii, a
> rotation matrix and a translation. Unfortunetly my code is way to slow to
> do
> this. It takes way to much GPU and graphic card memory. Drawing 16k
> ellipsoids is the maximum if I draw them in a loop using the provided
> sample
> code.
>
> I have read that there are people drawing about a million objects so I'm
> wondering why I'm that slow when drawing only half a million simple
> ellipsoids.
>
> In oder to give you some background information:
>  I want to draw 500k Ellipsoids
>  Rotation matrix(already combined, single matrices are not available) per
> ellipsoid
>  Translation vector per ellipsoid.
>  Set of radii per ellipsoid.
>
> This is my code sample. There is a loop using this code to draw all the
> ellipsoids, but for some reason it is terribly slow:
>
> //Start of sample
>
> vtkSmartPointer<vtkParametricEllipsoid> parametricVTKEllipsoid =
> vtkSmartPointer<vtkParametricEllipsoid>::New();
>         vtkSmartPointer<vtkParametricFunctionSource>
> parametricFunctionSource =
> vtkSmartPointer<vtkParametricFunctionSource>::New();
>         vtkSmartPointer<vtkMatrix4x4> transformationMatrix =
> vtkSmartPointer<vtkMatrix4x4>::New();
>         vtkSmartPointer<vtkMatrixToLinearTransform>
> matrixToLinearTransform =
> vtkSmartPointer<vtkMatrixToLinearTransform>::New();
>         vtkSmartPointer<vtkPolyDataMapper> mapper =
> vtkSmartPointer<vtkPolyDataMapper>::New();
>         vtkSmartPointer<vtkLODActor> actor =
> vtkSmartPointer<vtkLODActor>::New();
>
>         //Definition and transformation of the vtkEllipsoid
>         parametricVTKEllipsoid->SetXRadius(radius[0]);
>         parametricVTKEllipsoid->SetYRadius(radius[1]);
>         parametricVTKEllipsoid->SetZRadius(radius[2]);
>
> parametricFunctionSource->SetParametricFunction(parametricVTKEllipsoid);
>         parametricFunctionSource->Update();
>
>         //Configuration of the rotation/translation
>         configureMatrix(position, rotation, transformationMatrix);
>         matrixToLinearTransform->SetInput(transformationMatrix);
>         matrixToLinearTransform->Update();
>
>         mapper->SetInput(parametricFunctionSource->GetOutput());
>         actor->SetMapper(mapper);
>         actor->SetUserTransform(matrixToLinearTransform);
>
>         renderer_->AddActor(actor);
>
> //End of sample
>
> Regards,
> VoodooCode
>
>
>
> --
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