MATLAB: Use opengl in matlab , why it so slow

opengl

when I draw an image in figure using imshow with transparency property,The figure 'render' property changes to 'opengl' mode automatically,Then the figure reponse begin very slow！ what is problem?

Best Answer

Try using the command

opengl software

and see if it is any faster.

The OpenGL renderer is the only one that supports transparency. If you do not have a fast graphics card or do not have fast memory, then OpenGL can be slow.

What kind of graphics card do you have? If it is NVidia based, then when was the last time you checked to see whether there was a newer NVidia driver for the card?

Related Solutions

MATLAB: Is the WATERFALL command so slow in MATLAB 7 (R14)

This behavior is due to the way in which WATERFALL uses the renderers.

To work around this, set the renderer to OPENGL:

figure(1)
set(gcf,'renderer','opengl');
waterfall(x,y,z)

MATLAB: Do I get the warning “OpenGL is installed incorrectly” on Windows 7 SP1 with MATLAB 7.14 (R2012a)

OpenGL renderer has issues with the ATI Radeon Mobility HD5870 graphics card.

As a first step, check if the OpenGL driver is working correctly. To do so, run the OpenGL screen saver and see if everything looks okay.

1) Right-click on the Windows desktop and select “Personalization”.

2) In the ensuing dialog box, select the “Screen Saver tab” and run an OpenGL screen saver such as “bubbles”.

If the screen saver runs fine, then OpenGL is working correctly.

Reason for the error message

---------------------------------------

Incompatibility between the graphics drivers and MATLAB 7.14 (R2012a).

Solution

---------------------------------------

Graphics drivers should be updated to the latest version.

Workaround

---------------------------------------

Meanwhile, before correct drivers are installed, use this work around:

Step1: Usage of Software OpenGL Renderer

Execute the command below on MATLAB command prompt.

   opengl software

Rerun the MATLAB code file and check if this fixes the issue.

Once the current graphics adapter drivers are installed and are up-to-date, hardware OpenGL can be activated back by executing

opengl hardware

If step 1) of the Workaround does not help, follow the step 2).

Step 2: Disabling OpenGL from being chosen as default renderer by MATLAB 7.14 (R2012a).

   opengl neverselect

This disables OpenGL from being chosen as the default renderer.

Object transparency functionality is not available when OpenGL is disabled.

Rerun the MATLAB code file and check if this fixes the issue.

Best Answer

Related Solutions

MATLAB: Is the WATERFALL command so slow in MATLAB 7 (R14)

MATLAB: Do I get the warning “OpenGL is installed incorrectly” on Windows 7 SP1 with MATLAB 7.14 (R2012a)

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