class QGoochMaterial

The QGoochMaterial provides a material that implements the Gooch shading model, popular in CAD and CAM applications. More…

Synopsis

Properties

• alphaᅟ

• betaᅟ

• coolᅟ

• diffuseᅟ

• shininessᅟ

• specularᅟ

• warmᅟ

Methods

• def __init__()

• def alpha()

• def beta()

• def cool()

• def diffuse()

• def shininess()

• def specular()

• def warm()

Slots

• def setAlpha()

• def setBeta()

• def setCool()

• def setDiffuse()

• def setShininess()

• def setSpecular()

• def setWarm()

Signals

• def alphaChanged()

• def betaChanged()

• def coolChanged()

• def diffuseChanged()

• def shininessChanged()

• def specularChanged()

• def warmChanged()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

The Gooch lighting model uses both color and brightness to help show the curvature of 3D surfaces. This is often better than models such as Phong that rely purely upon changes in brightness. In situations such as in CAD and CAM applications where photorealism is not a goal, the Gooch shading model in conjunction with some kind of silhouette edge inking is a popular solution.

The Gooch lighting model is explained fully in the original Gooch paper . The Gooch model mixes a diffuse object color with a user-provided cool color and warm color to produce the end points of a color ramp that is used to shade the object based upon the cosine of the angle between the vector from the fragment to the light source and the fragment’s normal vector. Optionally, a specular highlight can be added on top. The relative contributions to the cool and warm colors by the diffuse color are controlled by the alpha and beta properties respecitvely.

This material uses an effect with a single render pass approach and performs per fragment lighting. Techniques are provided for OpenGL 2, OpenGL 3 or above as well as OpenGL ES 2.

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property alphaᅟ: float

Holds the current alpha value. The start point of the color ramp used by the Gooch shader is calculated as {c = cool + alpha * diffuse}.

Access functions:

• alpha()

• setAlpha()

• Signal alphaChanged()

property betaᅟ: float

Holds the current beta value. The start point of the color ramp used by the Gooch shader is calculated as {c = warm + beta * diffuse}.

Access functions:

• beta()

• setBeta()

• Signal betaChanged()

property coolᅟ: QColor

Holds the current cool color.

Access functions:

• cool()

• setCool()

• Signal coolChanged()

property diffuseᅟ: QColor

Holds the current diffuse color.

Access functions:

• diffuse()

• setDiffuse()

• Signal diffuseChanged()

property shininessᅟ: float

Holds the current shininess value. Higher values of shininess result in a smaller and brighter highlight.

Access functions:

• shininess()

• setShininess()

• Signal shininessChanged()

property specularᅟ: QColor

Holds the current specular color.

Access functions:

• specular()

• setSpecular()

• Signal specularChanged()

property warmᅟ: QColor

Holds the current warm color.

Access functions:

• warm()

• setWarm()

• Signal warmChanged()

__init__([parent=None])

Parameters:

parent – QNode

Constructs a new QGoochMaterial instance with parent object parent.

alpha()

Return type:

float

See also

setAlpha()

Getter of property alphaᅟ .

alphaChanged(alpha)

Parameters:

alpha – float

Notification signal of property alphaᅟ .

beta()

Return type:

float

See also

setBeta()

Getter of property betaᅟ .

betaChanged(beta)

Parameters:

beta – float

Notification signal of property betaᅟ .

cool()

Return type:

QColor

See also

setCool()

Getter of property coolᅟ .

coolChanged(cool)

Parameters:

cool – QColor

Notification signal of property coolᅟ .

diffuse()

Return type:

QColor

See also

setDiffuse()

Getter of property diffuseᅟ .

diffuseChanged(diffuse)

Parameters:

diffuse – QColor

Notification signal of property diffuseᅟ .

setAlpha(alpha)

Parameters:

alpha – float

See also

alpha()

Setter of property alphaᅟ .

setBeta(beta)

Parameters:

beta – float

See also

beta()

Setter of property betaᅟ .

setCool(cool)

Parameters:

cool – QColor

See also

cool()

Setter of property coolᅟ .

setDiffuse(diffuse)

Parameters:

diffuse – QColor

See also

diffuse()

Setter of property diffuseᅟ .

setShininess(shininess)

Parameters:

shininess – float

See also

shininess()

Setter of property shininessᅟ .

setSpecular(specular)

Parameters:

specular – QColor

See also

specular()

Setter of property specularᅟ .

setWarm(warm)

Parameters:

warm – QColor

See also

warm()

Setter of property warmᅟ .

shininess()

Return type:

float

See also

setShininess()

Getter of property shininessᅟ .

shininessChanged(shininess)

Parameters:

shininess – float

Notification signal of property shininessᅟ .

specular()

Return type:

QColor

See also

setSpecular()

Getter of property specularᅟ .

specularChanged(specular)

Parameters:

specular – QColor

Notification signal of property specularᅟ .

warm()

Return type:

QColor

See also

setWarm()

Getter of property warmᅟ .

warmChanged(warm)

Parameters:

warm – QColor

Notification signal of property warmᅟ .