Sharedwww / talks / 2006-05-09-sage-digipen / tutorial / raypicking-1.pyOpen in CoCalc
Author: William A. Stein
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# Soya 3D tutorial
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# Copyright (C) 2001-2004 Jean-Baptiste LAMY
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# raypicking-1: Laser
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# This lesson includes a red laser ray and 3 rotating cubes.
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# Move the mouse to move the laser.
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# In particular, lasers have been used while testing raypicking function.
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# BTW, the laser code (in soya/laser.py) is fully in Python and uses less that 60 lines
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# of code, so you might want to take a look at it.
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import sys, os, os.path, soya, soya.cube, soya.laser, soya.sdlconst
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soya.init()
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soya.path.append(os.path.join(os.path.dirname(sys.argv[0]), "data"))
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# Creates the scene.
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scene = soya.World()
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# Adds 3 rotating cubes in it (see basic-2.py about rotating volume).
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cube_world = soya.cube.Cube()
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cube_shape = cube_world.shapify()
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class RotatingCube(soya.Volume):
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def __init__(self, parent, angle_speed):
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soya.Volume.__init__(self, parent, cube_shape)
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self.angle_speed = angle_speed
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def advance_time(self, proportion):
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self.rotate_incline(0.2 * proportion * self.angle_speed)
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cube_1 = RotatingCube(scene, 5.0)
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cube_1.set_xyz(-1.1, 0.5, 0.0)
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cube_2 = RotatingCube(scene, -5.0)
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cube_2.set_xyz(-1.5, -1.5, 0.0)
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cube_3 = RotatingCube(scene, 5.0)
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cube_3.set_xyz(1.1, -0.5, 0.0)
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cube_3.scale(0.5, 0.5, 0.5)
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# Adds a light.
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light = soya.Light(scene)
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light.set_xyz(0.0, 0.2, 1.0)
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# Creates a camera.
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camera = soya.Camera(scene)
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camera.set_xyz(0.0, -1.0, 3.0)
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soya.set_root_widget(camera)
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# Hide the mouse cursor
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soya.cursor_set_visible(0)
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# MouseLaser is a subclass of laser that is controlled by the mouse.
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class MouseLaser(soya.laser.Laser):
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def begin_round(self):
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soya.laser.Laser.begin_round(self)
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# Processes the events
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for event in soya.process_event():
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if event[0] == soya.sdlconst.MOUSEMOTION:
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# For mouse motion event, rotate the laser (quite) toward the mouse.
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# The formulas are empirical; see soya.cursor for a better algorithm
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# if you want to translate mouse positions into 3D coordinates.
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mouse = soya.Point(
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scene,
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(float(event[1]) / camera.get_screen_width () - 0.5) * 4.0,
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(float(event[2]) / camera.get_screen_height() - 0.5) * -4.0,
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0.0,
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)
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self.look_at(mouse)
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# Creates a red mouse-controlled laser, which reflect on walls.
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# You can change the laser color with laser.color = (r, g, b, a).
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laser = MouseLaser(scene, reflect = 1)
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laser.y = -2.5
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scene.x = 1.0
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# Main loop
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soya.Idler(scene).idle()
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# TODO (left as an exercice):
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# Turn this tutorial lesson into a full game, where the player must shoot
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# with the laser a specific target (or monsters).
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# The levels includes different moving and rotating obstacles.
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# A multiplayer version uses two laser, one for each player, and two targets.
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# Hint :
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# the laser.points list contains all the points that define the laser trajectory.
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# use laser.color to change the color of the laser.
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# Good luck!
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