SoPostEffectEdges

InventorModule

author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	SoRenderers
definition	SoRenderers.def

Purpose

The SoPostEffectEdges module detects and renders edges as an effect for the SoPostEffectRenderer module.

There are three different modes (field Mode).

• SobelDepth calculates the edges using a Sobel filter on the depth values of the depth buffer. It only shows edges based on depth differences, not on inner creases.
• RobertsDepthNormal calculates the edges based on the normals and the depth. This shows inner creases.
• EmissiveColor calculates the edges using the emissive color buffer. This allows for only rendering edges around objects that are highlighted using the emissive color (see SoMaterial).

Parameter Fields

Field Index

Blur: Bool	Exponent: Float
Blur Kernel Size: Integer	Mode: Enum
colorBufferName: String	Normal Angle Threshold: Float
Depth Sensitivity: Float	normalBufferName: String
depthBufferName: String	Sampling Distance: Float
Edge Color: Color
emissiveBufferName: String
Enabled: Bool

Visible Fields

Enabled

name: enabled, type: Bool, default: TRUE

If checked, the effect is enabled.

Edge Color

name: edgeColor, type: Color, default: 0 0 0

Sets the color of the edge.

Sampling Distance

name: samplingDistance, type: Float, default: 1, minimum: 1, maximum: 4

Sets the sample distance. Default is 1 pixel. Larger sample distances generate bigger edges with less quality.

Normal Angle Threshold

name: normalAngleThreshold, type: Float, default: 35, minimum: 10, maximum: 180

Sets the angle at which two normals are considered similar.

Depth Sensitivity

name: depthSensitivity, type: Float, default: 0.40000001, minimum: 0, maximum: 10

Sets the sensitivity of the depth comparison.

Exponent

name: exponent, type: Float, default: 1, minimum: 1, maximum: 10

Sets the exponent to choose the sensitivity of the Sobel filter.

Blur

name: blur, type: Bool, default: FALSE

If checked, the blurring of the calculated edges is enabled.

Blur Kernel Size

name: blurKernelSize, type: Integer, default: 9, minimum: 3

Sets the size of the blur kernel.

Mode

name: mode, type: Enum, default: SobelDepth

Defines how to detect the edges.

Values:

Title	Name	Description
Sobel Depth	SobelDepth	Uses a Sobel filter on the depth buffer to detect edges. The Exponent allows for adjusting the sensitivity.
Roberts Depth Normal	RobertsDepthNormal	Uses the depth buffer and normal buffer to detect edges.
Emissive Color	EmissiveColor	Uses the emissive color buffer to detect edges. Requires that emissive colors are used for the objects that should get edges (see SoMaterial).

Hidden Fields

colorBufferName

name: colorBufferName, type: String, default: colorBuffer

normalBufferName

name: normalBufferName, type: String, default: normalBuffer

emissiveBufferName

name: emissiveBufferName, type: String, default: emissiveBuffer

depthBufferName

name: depthBufferName, type: String, default: depthBuffer