SoGVRGradientVolume¶

InventorModule¶

genre	`VolRendExtensions`
author	`MeVis Medical Solutions AG`
package	`MeVisLab/Standard`
dll	`SoGVR`
definition	soGVR.def
see also	`SoGVRVolumeRenderer`

Purpose¶

The SoGVRGradientVolume module allows to set a gradient volume that the SoGVRVolumeRenderer Illuminated mode will use instead of the internal Sobel3D filter.

Usage¶

The input image must have the same size as the input volume of the SoGVRVolRen. The gradient volume has to be unsigned int8 data. The image can either be a RGB, RGBA or Luminance image. The RGB component is interpreted as the gradient packed as unsigned int8. For a gradient from [-1,1], the integer value is calculated componentwise as given below:

myIntGradientX = uint8(myFloatGradientX * 127) + 128;

The A or L component gives the gradient strenght normalized from 0-255. If the image is a Luminance image, the gradient direction is calculated by the Sobel3D filter and the Luminance values are used as gradient strength.

Tips¶

The internal gradient estimator is quite good, so you seldom need this module, except when you want to experiment with different gradient strength values. It also has the disadvantage that it is a rather big additional volume (1-4 times the original image).

Input Fields¶

image¶

name: image, type: Image¶: ML image to use as gradient volume.

inVolume¶

name: inVolume, type: GVRVolume(MLBase)¶: GVRVolume to use as gradient volume.

Output Fields¶

self¶

name: self, type: SoNode¶: a node that should be put in front of the SoGVRVolumeRenderer