51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
# Copyright (C) 2022 RozK
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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 Affero General Public License as published by
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# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from itertools import chain
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from array import array
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from math import cos, sin
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# TODO: with FOV
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def sky_triangles(vsubdivs, distance, projection_ratio):
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assert vsubdivs > 0
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vertices = []
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hsubdivs = round(vsubdivs * projection_ratio)
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z = -distance
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width = distance * projection_ratio
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height = distance
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startx = width * -0.5
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starty = height * -0.5
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stepx = width / hsubdivs
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stepy = height / vsubdivs
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y1 = starty
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y2 = y1 + stepy
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for sy in range(vsubdivs):
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x1 = startx
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x2 = x1 + stepx
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for sx in range(hsubdivs):
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a = (x1, y2, z)
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b = (x2, y1, z)
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vertices.append((x1, y1, z))
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vertices.append(b)
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vertices.append(a)
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vertices.append((x2, y2, z))
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vertices.append(a)
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vertices.append(b)
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x1 = x2
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x2 += stepx
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y1 = y2
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y2 += stepy
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return array('f', chain.from_iterable(vertices))
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