[vtkusers] Render Speed (I know.. asked by many already..!)

[Lisa Avila]

Hello Ted,

First - a couple of questions:

1) How big is your image?

2) Are you measuring the render time just the first time the pipeline 
executes (which is usually slower than subsequent renders)?

Your graphics card should be fine - but you may have too big an image (if 
you have a 1024x1024 image that you are rendering into a 256x256 window, 
for example, then you can first subsample the image for improved 
performance).

Also - you are using a vtkWin32OpenGLRenderWindow - it is the concrete 
class created when you create a vtkRenderWindow (assuming you are on 
Windows and not using Mesa).

Lisa


At 05:33 PM 4/19/2004, Ted Vu wrote:
>Hello
>so my pipeline is just
>ImageData->ImageMapToColors->ImageActor
>
>And using render->GetLastRenderTimeInSeconds it takes about 0.1 s  to render
>
>However, I am building a real-time application (VTK+C++) and I need this 
>to be much faster, (maybe 5 times)
>Is there anything I can do to help this??
>
>How about using vtkWin32OpenGLRenderWindow?? Does this make things render 
>faster by basing the rendering on OpenGL?
>
>My graphics card is already pretty good,  I belive its a 128MB Nvidia GeForce
>
>I'd really like to stick to VTK for my application becuase its much easier 
>than directly using OpenGL.. but maybe I will have to resort to this?? If 
>anything can I make my own RenderWIndow class and call my own Render() 
>function where i will leave out the unnecessary computationally expensive 
>parts that are in it right now (or is this totally ridiculous and not 
>worth attempting?)
>
>Need some direction on how to go about this problem withouht having to buy 
>new hardware!!
>Thanks for you help
>t
>
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