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

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 .