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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
# Author: Nicolas P .Rougier, Lorenzo Gaifas
# Date: 04/03/2014
# -----------------------------------------------------------------------------
"""
Draw many colored cubes using instanced rendering
=================================================
"""
import numpy as np
from vispy import app, gloo, use
from vispy.gloo import Program, VertexBuffer, IndexBuffer
from vispy.util.transforms import perspective, translate, rotate
from vispy.geometry import create_cube
use(gl='gl+')
vertex = """
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
// per-vertex attributes
attribute vec3 position;
attribute vec2 texcoord;
attribute vec3 normal;
attribute vec4 color; // unused (it's returned by generate_cube() but we don't need it)
// per-instance attributes
attribute vec3 instance_shift;
attribute vec3 instance_color;
varying vec4 v_color;
void main()
{
v_color = vec4(instance_color, 1);
gl_Position = projection * view * model * vec4(position + instance_shift,1.0);
}
"""
fragment = """
varying vec4 v_color;
void main()
{
gl_FragColor = v_color;
}
"""
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, size=(512, 512), title='Colored instanced cube',
keys='interactive')
# Build cube data
V, I, _ = create_cube()
vertices = VertexBuffer(V)
self.indices = IndexBuffer(I)
instance_shift = VertexBuffer(((np.random.rand(100, 3) - 0.5) * 50).astype(np.float32), divisor=1)
instance_color = VertexBuffer(np.random.rand(5, 3).astype(np.float32), divisor=20)
# Build program
self.program = Program(vertex, fragment)
self.program.bind(vertices)
# Build view, model, projection & normal
view = translate((0, 0, -100))
model = np.eye(4, dtype=np.float32)
self.program['model'] = model
self.program['view'] = view
self.program['instance_shift'] = instance_shift
self.program['instance_color'] = instance_color
self.phi, self.theta = 0, 0
gloo.set_state(clear_color=(0.30, 0.30, 0.35, 1.00), depth_test=True)
self.activate_zoom()
self.timer = app.Timer('auto', self.on_timer, start=True)
self.show()
def on_draw(self, event):
gloo.clear(color=True, depth=True)
self.program.draw('triangles', self.indices)
def on_resize(self, event):
self.activate_zoom()
def activate_zoom(self):
gloo.set_viewport(0, 0, *self.physical_size)
projection = perspective(45.0, self.size[0] / float(self.size[1]),
2.0, 200.0)
self.program['projection'] = projection
def on_timer(self, event):
self.theta += .5
self.phi += .5
self.program['model'] = np.dot(rotate(self.theta, (0, 0, 1)),
rotate(self.phi, (0, 1, 0)))
self.update()
if __name__ == '__main__':
c = Canvas()
app.run()
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