1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vispy: gallery 5:105:5
"""
Draw 3D rotating Cube
=====================
This example shows how to display 3D objects.
"""
import numpy as np
from vispy import app, gloo
from vispy.util.transforms import perspective, translate, rotate
vert = """
// Uniforms
// ------------------------------------
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
uniform vec4 u_color;
// Attributes
// ------------------------------------
attribute vec3 a_position;
attribute vec4 a_color;
attribute vec3 a_normal;
// Varying
// ------------------------------------
varying vec4 v_color;
void main()
{
v_color = a_color * u_color;
gl_Position = u_projection * u_view * u_model * vec4(a_position,1.0);
}
"""
frag = """
// Varying
// ------------------------------------
varying vec4 v_color;
void main()
{
gl_FragColor = v_color;
}
"""
# -----------------------------------------------------------------------------
def cube():
"""
Build vertices for a colored cube.
V is the vertices
I1 is the indices for a filled cube (use with GL_TRIANGLES)
I2 is the indices for an outline cube (use with GL_LINES)
"""
vtype = [('a_position', np.float32, 3),
('a_normal', np.float32, 3),
('a_color', np.float32, 4)]
# Vertices positions
v = [[1, 1, 1], [-1, 1, 1], [-1, -1, 1], [1, -1, 1],
[1, -1, -1], [1, 1, -1], [-1, 1, -1], [-1, -1, -1]]
# Face Normals
n = [[0, 0, 1], [1, 0, 0], [0, 1, 0],
[-1, 0, 0], [0, -1, 0], [0, 0, -1]]
# Vertice colors
c = [[0, 1, 1, 1], [0, 0, 1, 1], [0, 0, 0, 1], [0, 1, 0, 1],
[1, 1, 0, 1], [1, 1, 1, 1], [1, 0, 1, 1], [1, 0, 0, 1]]
V = np.array([(v[0], n[0], c[0]), (v[1], n[0], c[1]),
(v[2], n[0], c[2]), (v[3], n[0], c[3]),
(v[0], n[1], c[0]), (v[3], n[1], c[3]),
(v[4], n[1], c[4]), (v[5], n[1], c[5]),
(v[0], n[2], c[0]), (v[5], n[2], c[5]),
(v[6], n[2], c[6]), (v[1], n[2], c[1]),
(v[1], n[3], c[1]), (v[6], n[3], c[6]),
(v[7], n[3], c[7]), (v[2], n[3], c[2]),
(v[7], n[4], c[7]), (v[4], n[4], c[4]),
(v[3], n[4], c[3]), (v[2], n[4], c[2]),
(v[4], n[5], c[4]), (v[7], n[5], c[7]),
(v[6], n[5], c[6]), (v[5], n[5], c[5])],
dtype=vtype)
I1 = np.resize(np.array([0, 1, 2, 0, 2, 3], dtype=np.uint32), 6 * (2 * 3))
I1 += np.repeat(4 * np.arange(2 * 3, dtype=np.uint32), 6)
I2 = np.resize(
np.array([0, 1, 1, 2, 2, 3, 3, 0], dtype=np.uint32), 6 * (2 * 4))
I2 += np.repeat(4 * np.arange(6, dtype=np.uint32), 8)
return V, I1, I2
# -----------------------------------------------------------------------------
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, keys='interactive', size=(800, 600))
self.vertices, self.filled, self.outline = cube()
self.filled_buf = gloo.IndexBuffer(self.filled)
self.outline_buf = gloo.IndexBuffer(self.outline)
self.program = gloo.Program(vert, frag)
self.program.bind(gloo.VertexBuffer(self.vertices))
self.view = translate((0, 0, -5))
self.model = np.eye(4, dtype=np.float32)
gloo.set_viewport(0, 0, self.physical_size[0], self.physical_size[1])
self.projection = perspective(45.0, self.size[0] /
float(self.size[1]), 2.0, 10.0)
self.program['u_projection'] = self.projection
self.program['u_model'] = self.model
self.program['u_view'] = self.view
self.theta = 0
self.phi = 0
gloo.set_clear_color('white')
gloo.set_state('opaque')
gloo.set_polygon_offset(1, 1)
self._timer = app.Timer('auto', connect=self.on_timer, start=True)
self.show()
# ---------------------------------
def on_timer(self, event):
self.theta += .5
self.phi += .5
self.model = np.dot(rotate(self.theta, (0, 1, 0)),
rotate(self.phi, (0, 0, 1)))
self.program['u_model'] = self.model
self.update()
# ---------------------------------
def on_resize(self, event):
gloo.set_viewport(0, 0, event.physical_size[0], event.physical_size[1])
self.projection = perspective(45.0, event.size[0] /
float(event.size[1]), 2.0, 10.0)
self.program['u_projection'] = self.projection
# ---------------------------------
def on_draw(self, event):
gloo.clear()
# Filled cube
gloo.set_state(blend=False, depth_test=True, polygon_offset_fill=True)
self.program['u_color'] = 1, 1, 1, 1
self.program.draw('triangles', self.filled_buf)
# Outline
gloo.set_state(blend=True, depth_test=True, polygon_offset_fill=False)
gloo.set_depth_mask(False)
self.program['u_color'] = 0, 0, 0, 1
self.program.draw('lines', self.outline_buf)
gloo.set_depth_mask(True)
# -----------------------------------------------------------------------------
if __name__ == '__main__':
canvas = Canvas()
app.run()
|
