3d Animated character hints using qt/opengles

[lcuk]

mikec

can i use the new qt sdk to do this sort of thing easily?
will the preincluded examples be simply runnable on the device?

[lcuk]

I did some searching and am going to play with this code a little bit

it uses pygame and makes a doody spinning globe with just a short script
the guy has been working on other things too, really cool to see
http://talk.maemo.org/showthread.php...175#post553175

[attila77]

Originally Posted by lcuk

there are pyqt apps springing up all over the place, but i don't know whether they include enough of the 3d api to be usable.

Both PySide and PyQt use PyOpenGL for the OpenGL heavy lifting, but that is AFAIK still not generally available on the N900 (sadly). However, if you just need GL-accelerated QGraphicsView/QGLWidgets, that's working already under PyQt (prolly PySide, too, but I didn't check)

[benj5386]

Can we have a paperclip?

[noobmonkey]

lcuk - http://johanneskuhlmann.de/blog/2010...head-tracking/ (i know double posting) - i want, nay i demand a desktop moving background that will track my ugly face and have stick women dancing! hehe

[lcuk]

Originally Posted by noobmonkey

lcuk - http://johanneskuhlmann.de/blog/2010...head-tracking/ (i know double posting) - i want, nay i demand a desktop moving background that will track my ugly face and have stick women dancing! hehe

the screen will crack if it tries to track your face

but yeah thats a really cool effect - the facial tracking alone would be cool
getting that in place on the main camera would be amazing
(for other things i'm thinking)

[mikec]

Originally Posted by lcuk

mikec

can i use the new qt sdk to do this sort of thing easily?
will the preincluded examples be simply runnable on the device?

Apologies have been in meetings all day.
Pygame is nice and portable, and sits ontop of the SDL GL stuff.

For Qt3D
I use the pyside demos and just replace the import statements with pyqt.

http://www.gitorious.net/pyside-examples

the hello qt application is there. The QGL widget will do the rendering, but I could not find the Python GL libs which this demo uses to create the 3d object . @atilla might know more about this.

As I know you are a lazy B*** here is the code

#!/usr/bin/env python

"""PySide port of the opengl/hellogl example from Qt v4.x"""

import sys
import math
from PySide import QtCore, QtGui, QtOpenGL

try:
    from OpenGL import GL
except ImportError:
    app = QtGui.QApplication(sys.argv)
    QtGui.QMessageBox.critical(None, "OpenGL hellogl",
                            "PyOpenGL must be installed to run this example.",
                            QtGui.QMessageBox.Ok | QtGui.QMessageBox.Default,
                            QtGui.QMessageBox.NoButton)
    sys.exit(1)


class Window(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        self.glWidget = GLWidget()

        self.xSlider = self.createSlider(QtCore.SIGNAL("xRotationChanged(int)"),
                                         self.glWidget.setXRotation)
        self.ySlider = self.createSlider(QtCore.SIGNAL("yRotationChanged(int)"),
                                         self.glWidget.setYRotation)
        self.zSlider = self.createSlider(QtCore.SIGNAL("zRotationChanged(int)"),
                                         self.glWidget.setZRotation)

        mainLayout = QtGui.QHBoxLayout()
        mainLayout.addWidget(self.glWidget)
        mainLayout.addWidget(self.xSlider)
        mainLayout.addWidget(self.ySlider)
        mainLayout.addWidget(self.zSlider)
        self.setLayout(mainLayout)

        self.xSlider.setValue(15 * 16)
        self.ySlider.setValue(345 * 16)
        self.zSlider.setValue(0 * 16)

        self.setWindowTitle(self.tr("Hello GL"))

    def createSlider(self, changedSignal, setterSlot):
        slider = QtGui.QSlider(QtCore.Qt.Vertical)

        slider.setRange(0, 360 * 16)
        slider.setSingleStep(16)
        slider.setPageStep(15 * 16)
        slider.setTickInterval(15 * 16)
        slider.setTickPosition(QtGui.QSlider.TicksRight)

        self.glWidget.connect(slider, QtCore.SIGNAL("valueChanged(int)"), setterSlot)
        self.connect(self.glWidget, changedSignal, slider, QtCore.SLOT("setValue(int)"))

        return slider


class GLWidget(QtOpenGL.QGLWidget):
    def __init__(self, parent=None):
        QtOpenGL.QGLWidget.__init__(self, parent)

        self.object = 0
        self.xRot = 0
        self.yRot = 0
        self.zRot = 0

        self.lastPos = QtCore.QPoint()

        self.trolltechGreen = QtGui.QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
        self.trolltechPurple = QtGui.QColor.fromCmykF(0.39, 0.39, 0.0, 0.0)

    def xRotation(self):
        return self.xRot

    def yRotation(self):
        return self.yRot

    def zRotation(self):
        return self.zRot

    def minimumSizeHint(self):
        return QtCore.QSize(50, 50)

    def sizeHint(self):
        return QtCore.QSize(400, 400)

    def setXRotation(self, angle):
        angle = self.normalizeAngle(angle)
        if angle != self.xRot:
            self.xRot = angle
            self.emit(QtCore.SIGNAL("xRotationChanged(int)"), angle)
            self.updateGL()

    def setYRotation(self, angle):
        angle = self.normalizeAngle(angle)
        if angle != self.yRot:
            self.yRot = angle
            self.emit(QtCore.SIGNAL("yRotationChanged(int)"), angle)
            self.updateGL()

    def setZRotation(self, angle):
        angle = self.normalizeAngle(angle)
        if angle != self.zRot:
            self.zRot = angle
            self.emit(QtCore.SIGNAL("zRotationChanged(int)"), angle)
            self.updateGL()

    def initializeGL(self):
        self.qglClearColor(self.trolltechPurple.darker())
        self.object = self.makeObject()
        GL.glShadeModel(GL.GL_FLAT)
        GL.glEnable(GL.GL_DEPTH_TEST)
        GL.glEnable(GL.GL_CULL_FACE)

    def paintGL(self):
        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
        GL.glLoadIdentity()
        GL.glTranslated(0.0, 0.0, -10.0)
        GL.glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
        GL.glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
        GL.glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
        GL.glCallList(self.object)

    def resizeGL(self, width, height):
        side = min(width, height)
        GL.glViewport((width - side) / 2, (height - side) / 2, side, side)

        GL.glMatrixMode(GL.GL_PROJECTION)
        GL.glLoadIdentity()
        GL.glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0)
        GL.glMatrixMode(GL.GL_MODELVIEW)

    def mousePressEvent(self, event):
        self.lastPos = QtCore.QPoint(event.pos())

    def mouseMoveEvent(self, event):
        dx = event.x() - self.lastPos.x()
        dy = event.y() - self.lastPos.y()

        if event.buttons() & QtCore.Qt.LeftButton:
            self.setXRotation(self.xRot + 8 * dy)
            self.setYRotation(self.yRot + 8 * dx)
        elif event.buttons() & QtCore.Qt.RightButton:
            self.setXRotation(self.xRot + 8 * dy)
            self.setZRotation(self.zRot + 8 * dx)

        self.lastPos = QtCore.QPoint(event.pos())

    def makeObject(self):
        genList = GL.glGenLists(1)
        GL.glNewList(genList, GL.GL_COMPILE)

        GL.glBegin(GL.GL_QUADS)

        x1 = +0.06
        y1 = -0.14
        x2 = +0.14
        y2 = -0.06
        x3 = +0.08
        y3 = +0.00
        x4 = +0.30
        y4 = +0.22

        self.quad(x1, y1, x2, y2, y2, x2, y1, x1)
        self.quad(x3, y3, x4, y4, y4, x4, y3, x3)

        self.extrude(x1, y1, x2, y2)
        self.extrude(x2, y2, y2, x2)
        self.extrude(y2, x2, y1, x1)
        self.extrude(y1, x1, x1, y1)
        self.extrude(x3, y3, x4, y4)
        self.extrude(x4, y4, y4, x4)
        self.extrude(y4, x4, y3, x3)

        Pi = 3.14159265358979323846
        NumSectors = 200

        for i in range(NumSectors):
            angle1 = (i * 2 * Pi) / NumSectors
            x5 = 0.30 * math.sin(angle1)
            y5 = 0.30 * math.cos(angle1)
            x6 = 0.20 * math.sin(angle1)
            y6 = 0.20 * math.cos(angle1)

            angle2 = ((i + 1) * 2 * Pi) / NumSectors
            x7 = 0.20 * math.sin(angle2)
            y7 = 0.20 * math.cos(angle2)
            x8 = 0.30 * math.sin(angle2)
            y8 = 0.30 * math.cos(angle2)

            self.quad(x5, y5, x6, y6, x7, y7, x8, y8)

            self.extrude(x6, y6, x7, y7)
            self.extrude(x8, y8, x5, y5)

        GL.glEnd()
        GL.glEndList()

        return genList

    def quad(self, x1, y1, x2, y2, x3, y3, x4, y4):
        self.qglColor(self.trolltechGreen)

        GL.glVertex3d(x1, y1, -0.05)
        GL.glVertex3d(x2, y2, -0.05)
        GL.glVertex3d(x3, y3, -0.05)
        GL.glVertex3d(x4, y4, -0.05)

        GL.glVertex3d(x4, y4, +0.05)
        GL.glVertex3d(x3, y3, +0.05)
        GL.glVertex3d(x2, y2, +0.05)
        GL.glVertex3d(x1, y1, +0.05)

    def extrude(self, x1, y1, x2, y2):
        self.qglColor(self.trolltechGreen.darker(250 + int(100 * x1)))

        GL.glVertex3d(x1, y1, +0.05)
        GL.glVertex3d(x2, y2, +0.05)
        GL.glVertex3d(x2, y2, -0.05)
        GL.glVertex3d(x1, y1, -0.05)

    def normalizeAngle(self, angle):
        while angle < 0:
            angle += 360 * 16
        while angle > 360 * 16:
            angle -= 360 * 16
        return angle


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

[lcuk]

Originally Posted by mikec

As I know you are a lazy B*** here is the code

ahem! not that lazy, but seeing a block of code here is much easier to handle than running around the whole web!

changing the code to be simply Pyqt4 will not run at all, so I went to install pyside

i installed pyside on my device ( http://pastebin.com/GFJYAm2t )

that installed cleanly and in return when running the example it gave me the polite UI error message.
I also cannot find the missing opengl import, i've left some messages around and got the pyside examples from the gitorious repository but they also offer no clues about where it may be.

pyside-qt4-opengl is installed cleanly which I would have guessed should include the baseline gl stuff but no cigar!

anyone else have clues?
this is a certainly a better position than yesterday even with failures

[attila77]

Originally Posted by attila77

Both PySide and PyQt use PyOpenGL for the OpenGL heavy lifting, but that is AFAIK still not generally available on the N900 (sadly).

For the record, the examples were originally written in PyQt but have been ported to PySide by the PySide team.

There is no hard dependency on PyOpenGL because there is a perfectly valid scenario using QGraphicsView with GL acceleration, for which it is not needed (unlike Qt3D).

[lcuk]

Originally Posted by attila77

For the record, the examples were originally written in PyQt but have been ported to PySide by the PySide team.

There is no hard dependency on PyOpenGL because there is a perfectly valid scenario using QGraphicsView with GL acceleration, for which it is not needed (unlike Qt3D).

Attila77 thanks for the clarification

however from the pyside examples, this is the line which fails:

http://www.gitorious.net/pyside-exam...logl.py#line10

try:
    from OpenGL import GL
except ImportError:
    app = QtGui.QApplication(sys.argv)
    QtGui.QMessageBox.critical(None, "OpenGL hellogl",
                            "PyOpenGL must be installed to run this example.",
                            QtGui.QMessageBox.Ok | QtGui.QMessageBox.Default,
                            QtGui.QMessageBox.NoButton)
    sys.exit(1)

where does the OpenGL module come from?