I have been trying to render two objects at the same time, but I don't find the right way.
The way I'm proceeding is by creating two different position vector matrix "V1" and "V2" for being able to move them independently inside the timer callback.
Is that possible?, I have tried it in many ways but none of them worked...
#!/usr/bin/env python
import numpy as np
from os import path as op
from vispy import gloo, app, scene
from vispy.gloo import Program, VertexBuffer, IndexBuffer
from vispy.util.transforms import perspective, translate, rotate
vertex = """
uniform mat4 model1;
uniform mat4 model2;
uniform mat4 view;
uniform mat4 projection;
uniform sampler2D texture;
attribute vec3 position1;
attribute vec3 position2;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main()
{
vec4 mp1 = model1 * vec4(position1,1.0);
vec4 mp2 = model2 * vec4(position2,1.0);
vec4 mp = mp1+mp2;
gl_Position = projection * view * mp;
v_texcoord = texcoord;
}
"""
fragment = """
void main()
{
}
"""
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, keys='interactive')
V = np.zeros(4, [("position1", np.float32, 3),
("texcoord", np.float32, 2)])
V2 = np.zeros(4, [("position2", np.float32, 3),
("texcoord", np.float32, 2)])
V["position1"] = [[ 1, 1, 0], [-1, 1, 0], [-1,-1, 0], [ 1,-1, 0]]
V2["position2"] = [[ 1, 1, 1], [-1, 1, 1], [-1,-1, 1], [ 1,-1, 1]]
V["texcoord"] = [[0,0], [0,1], [1,1], [1,0]]
V2["texcoord"] = [[0,0], [0,1], [1,1], [1,0]]
I = [0, 1, 2, 0, 2, 3]
vertices = VertexBuffer(V)
self.indices = IndexBuffer(I)
vertices2 = VertexBuffer(V2)
self.indices2 = IndexBuffer(I)
# Build program1
self.program1 = Program(vertex, fragment)
self.program1.bind(vertices)
self.program1.bind(vertices2)
# Build program1
# Build view, model, projection & normal
#view = np.eye(4, dtype=np.float32)
view = translate((0, 0, -5)).dot(rotate(-45, (1, 0, 0)))
model2 = np.eye(4, dtype=np.float32)
self.x,self.y, self.z = 0,5,0
model1 = translate((self.x, self.y, self.z))
self.program1['model1'] = model1
self.program1['view'] = view
gloo.set_viewport(0, 0, self.physical_size[0], self.physical_size[1])
self.projection = perspective(45.0, self.physical_size[0] /
float(self.physical_size[1]), 2.0, 30.0)
self.program1['projection'] = self.projection
# OpenGL initalization
gloo.set_state(clear_color=(1, 1, 1, 1.), depth_test=True)
self.show()
def on_draw(self, event):
gloo.clear(color=True, depth=True)
self.program1.draw('triangles', self.indices)
#self.program2.draw('triangles', self.indices2)
if __name__ == '__main__':
canvas = Canvas()
app.run()
I got it, anyway I don't know if it is the best way. Here is the code if it helps anyone:
#!/usr/bin/env python
import numpy as np
from vispy import gloo, app, scene
from vispy.gloo import Program, VertexBuffer, IndexBuffer
from vispy.util.transforms import perspective, translate, rotate
vertex = """
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
attribute vec3 position;
void main()
{
gl_Position = projection * view * model * vec4(position,1.0);
}
"""
fragment = """
void main()
{
//gl_FragColor = vec4 (0.0, 0.5, 0.0, 0.1);
}
"""
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, keys='interactive')
V = np.zeros(4, [("position", np.float32, 3)])
V["position"] = [[ 1, 1, 0], [-1, 1, 0], [-1,-1, 0], [ 1,-1, 0]]
I = [0, 1, 2, 0, 2, 3]
vertices = VertexBuffer(V)
self.indices = IndexBuffer(I)
# Build program1
self.program1 = Program(vertex, fragment)
self.program2 = Program(vertex, fragment)
self.program1.bind(vertices)
self.program2.bind(vertices)
# Build view, model, projection & normal
view = translate((0, 0, -5)).dot(rotate(-45, (1, 0, 0)))
self.model1 = translate((0, 5, 0))
self.model2 = self.model1.dot(translate((0, 0, 1)))
self.program1['model'] = self.model1
self.program2['model'] = self.model2
self.program1['view'] = view
self.program2['view'] = view
gloo.set_viewport(0, 0, self.physical_size[0], self.physical_size[1])
self.projection = perspective(45.0, self.physical_size[0] /
float(self.physical_size[1]), 2.0, 30.0)
self.program1['projection'] = self.projection
self.program2['projection'] = self.projection
# OpenGL initalization
gloo.set_state(clear_color=(1, 1, 1, 1.), depth_test=True)
self._timer = app.Timer('auto', connect=self.on_timer, start=True)
self.show()
def on_draw(self, event):
gloo.clear(color=True, depth=True)
self.program1.draw('triangles', self.indices)
self.program2.draw('triangles', self.indices)
def on_timer(self, event):
self.model1 = self.model1.dot(rotate(1, (0, 1, 0)))
self.model2 = self.model2.dot(rotate(-1, (0, 1, 0)))
self.program1['model'] = self.model1
self.program2['model'] = self.model2
self.update()
if __name__ == '__main__':
canvas = Canvas()
app.run()