IC Python API:Align to Camera

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Revision as of 23:22, 21 August 2019 by Chuck (RL) (Talk | contribs) (Created page with "{{TOC}} {{Parent|IC_Python_API:RL_Python_Samples|RL Python Samples}} frame This article will go over a script that can align pr...")

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Main article: RL Python Samples.
Ic python api align to camera 01.png

This article will go over a script that can align props in front of the current camera based on a user defined distance. We will go over using transform matrix calculations required to position and rotate world-space objects into transform space locations and orientations.

Required Modules

Besides the fundamental Reallusion Python module, we'll also need Pyside2 and os to read the QT UI file and build the user interface.

import RLPy
import os
from PySide2 import *
from PySide2.shiboken2 import wrapInstance

Align to Camera Function

def align_to_camera():
    items = RLPy.RScene.GetSelectedObjects()

    if len(items) > 0:
        if items[0].GetType() == RLPy.EObjectType_Prop:

            camera = RLPy.RScene.GetCurrentCamera()
            camera_transform = camera.WorldTransform()
            transform_matrix = camera_transform.Matrix()

            offset_matrix = RLPy.RMatrix4()
            offset_matrix.MakeIdentity()
            offset_matrix.SetTranslate(RLPy.RVector3(0, 0, -widget.distance.value()))

            transform_matrix = offset_matrix * transform_matrix

            new_transform = RLPy.RTransform()
            new_transform.From(transform_matrix)

            transform_control = items[0].GetControl("Transform")
            transform_control.SetValue(RLPy.RGlobal.GetTime(), new_transform)


Creating the UI

window = RLPy.RUi.CreateRDialog()
window.SetWindowTitle("Align Prop to Camera")

dialog = wrapInstance(int(window.GetWindow()), QtWidgets.QDialog)
dialog.setFixedWidth(350)

qt_ui_file = QtCore.QFile(os.path.dirname(__file__) + "/Align_to_Camera.ui")
qt_ui_file.open(QtCore.QFile.ReadOnly)
widget = QtUiTools.QUiLoader().load(qt_ui_file)
qt_ui_file.close()

dialog.layout().addWidget(widget)

widget.pushButton.clicked.connect(align_to_camera)

window.Show()

Everything Put Together

import RLPy
import os
from PySide2 import *
from PySide2.shiboken2 import wrapInstance


def align_to_camera():
    items = RLPy.RScene.GetSelectedObjects()

    if len(items) > 0:
        if items[0].GetType() == RLPy.EObjectType_Prop:

            camera = RLPy.RScene.GetCurrentCamera()
            camera_transform = camera.WorldTransform()
            transform_matrix = camera_transform.Matrix()

            offset_matrix = RLPy.RMatrix4()
            offset_matrix.MakeIdentity()
            offset_matrix.SetTranslate(RLPy.RVector3(0, 0, -widget.distance.value()))

            transform_matrix = offset_matrix * transform_matrix

            new_transform = RLPy.RTransform()
            new_transform.From(transform_matrix)

            transform_control = items[0].GetControl("Transform")
            transform_control.SetValue(RLPy.RGlobal.GetTime(), new_transform)


window = RLPy.RUi.CreateRDialog()
window.SetWindowTitle("Align Prop to Camera")

dialog = wrapInstance(int(window.GetWindow()), QtWidgets.QDialog)
dialog.setFixedWidth(350)

qt_ui_file = QtCore.QFile(os.path.dirname(__file__) + "/Align_to_Camera.ui")
qt_ui_file.open(QtCore.QFile.ReadOnly)
widget = QtUiTools.QUiLoader().load(qt_ui_file)
qt_ui_file.close()

dialog.layout().addWidget(widget)

widget.pushButton.clicked.connect(align_to_camera)

window.Show()

APIs Used

You can research the following references for the APIs deployed in this code.