SoGVRShaderParameterDirection

InventorModule

author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	SoGVR
definition	SoGVRShaderPipeline.def
see also	SoGVRVolumeRenderer
keywords	pipeline

Purpose

The SoGVRShaderParameterDirection module adds a directional shader parameter (aka uniform) to the scene. Directions are special in that they are transformed using the inverse-transposed of the transformation matrix to preserve the direction in non-uniform scaled transforms.

Usage

The direction is specified in either world or eye (aka camera) coordinates. It is available in the GVR shader and can be used in any SoGVRShaderFunction.

The parameter is available in various coordinate systems, which are appended as suffixes to its Name.

suffix	coordinate system
_eye	eye/camera coordinates
_world	world coordinates
_voxel	voxel coordinates
_scaledVoxel	scaled voxel coordinates (voxel coordinates multiplied by voxel size)

Windows

Default Panel

Output Fields

self

name: self, type: SoNode

Place the output into any Open Inventor scene in front of a SoGVRVolumeRenderer.

Parameter Fields

Field Index

Coordinate System: Enum

Direction: Vector3

Enabled: Bool

Name: String

Normalize: Bool

Visible Fields

Enabled

name: enabled, type: Bool, default: TRUE

Enables the module.

Name

name: name, type: String

Defines the base name of the parameter in the shader, it becomes available in the SoGVRShaderFunction via name_eye, name_world, name_voxel and name_scaledVoxel.

Coordinate System

name: coordinateSystem, type: Enum, default: WorldCoordinates

Defines the source coordinate system in which the Direction is given.

Values:

Title	Name	Description
World Coordinates	WorldCoordinates	World coordinates
Eye Coordinates	EyeCoordinates	Eye/Camera coordinate system

Direction

name: direction, type: Vector3, default: 0 0 1

Defines the direction parameter.

Normalize

name: normalize, type: Bool, default: TRUE

If enabled, the direction is normalized in all provided coordinates systems.