class QAlphaTest

The QAlphaTest class specify alpha reference test. More…

Synopsis

Properties

• alphaFunctionᅟ

• referenceValueᅟ

Methods

• def __init__()

• def alphaFunction()

• def referenceValue()

Slots

• def setAlphaFunction()

• def setReferenceValue()

Signals

• def alphaFunctionChanged()

• def referenceValueChanged()

Note

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Detailed Description

As the OpenGL documentation explains; The alpha test discards a fragment conditional on the outcome of a comparison between the incoming fragment’s alpha value and a constant reference value.

class AlphaFunction

Enumeration for the alpha function values

Constant	Description
Qt3DRender.QAlphaTest.Never	Never pass alpha test
Qt3DRender.QAlphaTest.Always	Always pass alpha test
Qt3DRender.QAlphaTest.Less	Pass alpha test if fragment alpha is less than reference value
Qt3DRender.QAlphaTest.LessOrEqual	Pass alpha test if fragment alpha is less than or equal to reference value
Qt3DRender.QAlphaTest.Equal	Pass alpha test if fragment alpha is equal to reference value
Qt3DRender.QAlphaTest.GreaterOrEqual	Pass alpha test if fragment alpha is greater than or equal to reference value
Qt3DRender.QAlphaTest.Greater	Pass alpha test if fragment alpha is greater than reference value
Qt3DRender.QAlphaTest.NotEqual	Pass alpha test if fragment alpha is not equal to reference value

Note

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

property alphaFunctionᅟ: Qt3DRender.QAlphaTest.AlphaFunction

Holds the alpha function used by the alpha test. Default is Never.

Access functions:

• alphaFunction()

• setAlphaFunction()

• Signal alphaFunctionChanged()

property referenceValueᅟ: float

Holds the reference value used by the alpha test. Default is 0.0. When set, the value is clamped between 0 and 1.

Access functions:

• referenceValue()

• setReferenceValue()

• Signal referenceValueChanged()

__init__([parent=None])

Parameters:

parent – QNode

alphaFunction()

Return type:

AlphaFunction

See also

setAlphaFunction()

Getter of property alphaFunctionᅟ .

alphaFunctionChanged(alphaFunction)

Parameters:

alphaFunction – AlphaFunction

Notification signal of property alphaFunctionᅟ .

referenceValue()

Return type:

float

See also

setReferenceValue()

Getter of property referenceValueᅟ .

referenceValueChanged(referenceValue)

Parameters:

referenceValue – float

Notification signal of property referenceValueᅟ .

setAlphaFunction(alphaFunction)

Parameters:

alphaFunction – AlphaFunction

See also

alphaFunction()

Setter of property alphaFunctionᅟ .

setReferenceValue(referenceValue)

Parameters:

referenceValue – float

See also

referenceValue()

Setter of property referenceValueᅟ .