尝试使用 Vispy 在 3d 中旋转四边形
Trying to rotate a quad in 3d using Vispy
我正在尝试使用 Vispy 在 3d 中旋转带纹理的四边形,但我似乎无法解决。该代码没有产生任何特定错误,但它根本没有旋转。我是 Vispy 的新手,也许我的代码中缺少一些重要的组件。也许你们中的一些人以前已经解决过类似的问题。给我一些见解将有很大帮助。这是代码:
import numpy as np
from vispy import gloo, app
app.use_app('pyqt5')
from vispy.gloo import Program
from vispy.util.transforms import perspective, translate, rotate
import imageio
im = imageio.imread('C:\vhosts\VIDEO_TWO_CLONE\fol1\im.jpg')
vertex = """
uniform mat4 u_model;
attribute vec2 position;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main()
{
gl_Position = u_model * vec4(position, 0.0, 1.0);
v_texcoord = texcoord;
} """
fragment = """
uniform sampler2D texture;
varying vec2 v_texcoord;
void main()
{
gl_FragColor = texture2D(texture, v_texcoord);
} """
def checkerboard(grid_num=8, grid_size=32):
row_even = grid_num // 2 * [0, 1]
row_odd = grid_num // 2 * [1, 0]
Z = np.row_stack(grid_num // 2 * (row_even, row_odd)).astype(np.uint8)
return 255 * Z.repeat(grid_size, axis=0).repeat(grid_size, axis=1)
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, size=(512, 512), title='Textured quad',
keys='interactive')
self.model = np.eye(4, dtype=np.float32)
# Build program & data
self.program = Program(vertex, fragment, count=4)
self.program['position'] = [(1, 1), (-1, 1),
(1, -1), (-1, -1)]
self.program['texcoord'] = [(0, 0), (1, 0), (0, 1), (1, 1)]
self.program['texture'] = im # checkerboard()
self.program['u_model'] = self.model
self.theta = 0
self.phi = 0
gloo.set_viewport(0, 0, *self.physical_size)
self.show()
def on_draw(self, event):
gloo.set_clear_color('white')
gloo.clear(color=True)
self.program.draw('triangle_strip')
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)
if __name__ == '__main__':
c = Canvas()
app.run()
uniform矩阵model
,它定义了模型的位置和旋转是
在方法 on_timer
中设置。每次执行 on_timer
时,模型矩阵都会发生变化,并且会 旋转 模型。
但似乎计时器从未启动并且从未执行过on_timer
。
要启动计时器,您必须在初始化期间调用 app.Timer
。
在 class Canvas
:
的构造函数中放入类似于以下代码的内容
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, size=(512, 512), title='Textured quad', keys='interactive')
.......
self._timer = app.Timer('auto', connect=self.on_timer, start=True)
我正在尝试使用 Vispy 在 3d 中旋转带纹理的四边形,但我似乎无法解决。该代码没有产生任何特定错误,但它根本没有旋转。我是 Vispy 的新手,也许我的代码中缺少一些重要的组件。也许你们中的一些人以前已经解决过类似的问题。给我一些见解将有很大帮助。这是代码:
import numpy as np
from vispy import gloo, app
app.use_app('pyqt5')
from vispy.gloo import Program
from vispy.util.transforms import perspective, translate, rotate
import imageio
im = imageio.imread('C:\vhosts\VIDEO_TWO_CLONE\fol1\im.jpg')
vertex = """
uniform mat4 u_model;
attribute vec2 position;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main()
{
gl_Position = u_model * vec4(position, 0.0, 1.0);
v_texcoord = texcoord;
} """
fragment = """
uniform sampler2D texture;
varying vec2 v_texcoord;
void main()
{
gl_FragColor = texture2D(texture, v_texcoord);
} """
def checkerboard(grid_num=8, grid_size=32):
row_even = grid_num // 2 * [0, 1]
row_odd = grid_num // 2 * [1, 0]
Z = np.row_stack(grid_num // 2 * (row_even, row_odd)).astype(np.uint8)
return 255 * Z.repeat(grid_size, axis=0).repeat(grid_size, axis=1)
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, size=(512, 512), title='Textured quad',
keys='interactive')
self.model = np.eye(4, dtype=np.float32)
# Build program & data
self.program = Program(vertex, fragment, count=4)
self.program['position'] = [(1, 1), (-1, 1),
(1, -1), (-1, -1)]
self.program['texcoord'] = [(0, 0), (1, 0), (0, 1), (1, 1)]
self.program['texture'] = im # checkerboard()
self.program['u_model'] = self.model
self.theta = 0
self.phi = 0
gloo.set_viewport(0, 0, *self.physical_size)
self.show()
def on_draw(self, event):
gloo.set_clear_color('white')
gloo.clear(color=True)
self.program.draw('triangle_strip')
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)
if __name__ == '__main__':
c = Canvas()
app.run()
uniform矩阵model
,它定义了模型的位置和旋转是
在方法 on_timer
中设置。每次执行 on_timer
时,模型矩阵都会发生变化,并且会 旋转 模型。
但似乎计时器从未启动并且从未执行过on_timer
。
要启动计时器,您必须在初始化期间调用 app.Timer
。
在 class Canvas
:
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, size=(512, 512), title='Textured quad', keys='interactive')
.......
self._timer = app.Timer('auto', connect=self.on_timer, start=True)