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# Copyright (C) 2001-2002 Bertrand 'blam!' LAMY
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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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# 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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# 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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# ---------------------
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# Lesson 104: Landscape
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# ---------------------
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# This lesson shows how to make a landscape (also known as heightmap)
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import random, os, os.path, sys, time
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data_dir = os.path.join(os.path.dirname(os.path.abspath(sys.argv[0])), "data")
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soya.model.Image .PATH = os.path.join(data_dir, "images")
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soya.model.Material.PATH = os.path.join(data_dir, "materials")
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soya.soya3d.World .PATH = os.path.join(data_dir, "worlds")
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soya.model.Shape .PATH = os.path.join(data_dir, "shapes")
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world = soya.soya3d.World()
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light = soya.soya3d.Light(world)
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light.set_xyz(0.0, 15.0, 0.0)
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# There are 2 ways to create a landscape:
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# 1) give each height value
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# 2) create a landscape from an image (white pixels are upper)
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land = soya.land.Land(land_size)
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# Land_size is the size of the landscape. Landscapes are always squares
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# and their size must always be like this : (2^n)+1
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# The following lines set randomized value for each height
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while (i < land_size):
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while (j < land_size):
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land.set_height(i, j, random.random())
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# Multiply all the heights by 4
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land.multiply_height(4.0)
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# Now we must set a Material to the Land. Land must always have a Material
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# even if it is None (None is a white Material)
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while (i < land_size):
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while (j < land_size):
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land.set_material(i, j, None)
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# Above lines are quite useless. Now we will see how to create a Land from
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# an image and how to texture it quickly
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land = soya.land.Land(0)
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# The size of 0 will be overriden by the size of the image
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land.from_image(soya.model.Image("map1.tga"))
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# Heights range from 0.0 (black pixels) to 1.0 (white pixels)
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land.multiply_height(8.0)
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material1 = soya.model.Material()
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material1.tex_filename = "block2.tga"
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material2 = soya.model.Material()
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material2.tex_filename = "metal1.tga"
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# land.set_material_layer(MATERIAL, FROM, TO)
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# Set to all points that have a height between FROM and TO the material
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land.set_material_layer(material1, 0.0, 6.0)
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land.set_material_layer(material2, 6.0, 8.0)
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# land.set_material_layer_angle(MATERIAL, HEIGHT_FROM, HEIGHT_TO, ANGLE_FROM, ANGLE_TO)
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# This function works just has the previous one but add 2 more arguments:
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# ANGLE_FROM and ANGLE_TO.
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# This means that all points of the land will have the given material
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# - its height is between HEIGHT_FROM and HEIGHT_TO
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# - its normal makes an angle with the horizontal plane that is between ANGLE_FROM
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# and ANGLE_TO (expressed in degrees).
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land.set_material_layer_angle(material1, 0.0, 8.0, 0.0, 20.0)
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# Now we will see some Land attributes:
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land.scale_factor = 1.5
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# This is the distance between 2 consecutive heights that you have given
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# to define the Land. This is quite like doing the following:
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# world.scale(1.5, 1.0, 1.5)
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# Default value is 1.5
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land.texture_factor = 1.0
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# This factor is applied to texture coordinates when rendering the Land.
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# Default value is 1.0
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land.split_factor = 4.0
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# These 2 values influence the behaviour of the level of detail algorithm
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# (it means that there are more triangles to draw the Land near the Camera
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# and less far from the Camera).
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# The higher split_factor is, the better precision you have (it means more
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# triangles to draw the Land even at long distance from Camera).
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# map_size represents the size of a map. A map is a square part of the Land
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# that computes its visibility and precision.
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# map_size and split_factor values can change FPS (rendering speed). Values
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# above are default ones (I get the best FPS with these ones on my computer)
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# Land is a shape (and so can't be added in a World but must be set as shape)
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world.set_shape(land)
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# Add a camera and a loop to render
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camera = soya.soya3d.Camera(world)
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camera.set_xyz (16.0, 8.0, 0.0)
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camera.look_at (soya.soya3d.Point (world, 16.0, 6.0, 10.0))
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soya.set_root_widget(camera)
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# Use Up, Down, Left, Right arrows to move the camera
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for event in soya.process_event():
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if event[0] == soya.KEYDOWN:
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if event[1] == soya.K_UP:
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camera.translate(0.0, 0.0, 0.5)
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elif event[1] == soya.K_DOWN:
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camera.translate(0.0, 0.0, -0.5)
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elif event[1] == soya.K_LEFT:
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camera.translate(0.5, 0.0, 0.0)
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elif event[1] == soya.K_RIGHT:
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camera.translate(-0.5, 0.0, 0.0)
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elif event[1] == soya.K_q:
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# Other Land functions not aborded in this tutorial (easy to understand):
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# -----------------------------------------------------------------------
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# height = land.get_height(x, z)
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# material = land.get_material(x, z)
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# land.add_height(value)
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# [x and z are integers, value and height are floats]
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tutorial/lesson-104.py
