The MIP viewer may become disabled for a number of reasons.
On both Windows and Mac, review the following:
In Tools → Configuration → Data, is the ‘Disable MIP Viewer’ box checked? If so – uncheck it.
Is the checkbox grayed out and unclickable?
Perhaps you have loaded planar data?
A MIP cannot be generated with planar data. If your data is not planar, VQ may be interpreting it as such if the Max Voxsize Ratio is less than that of your image. You can increase the ratio by navigating to Tools → Configuration → Data, and increasing the number for the field “Max voxsize ratio for vol.” Try 20 or higher.
Ensure OpenGL is installed – 2.0 is the minimum but 3.0+ is preferred. This is provided by your graphics card driver installer.
The issue may lie with your graphics driver. Just having a powerful/modern GPU may not be enough if the manufacturer driver is not installed.
Open device manager from control panel (note: this will require admin access or IT support). Expand the entry for ‘Display adapters’:
If you see ‘ Microsoft Basic Display Adapter’ listed, that device does not support VivoQuant requirements of OpenGL 2.0. You must install the manufacturer driver – please contact your IT helpdesk as necessary.
VTK is Disabled
VTK can be enabled with a registry string value added to: Computer\HKEY_CURRENT_USER\Software\inviCRO\VivoQuant\MIP
The name must be: QVTKWidgetCreationFail and the value must be ‘false’.
A restart of VivoQuant is required.
To enable VTK on Mac, run the following command in a terminal with Admin rights:
defaults write com.invicro.VivoQuant "MIP.QVTKWidgetCreationFail" 0