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'''
Added a simple camera class to an existing example.
The camera class is built using following tutorials:
https://learnopengl.com/Getting-started/Camera
http://in2gpu.com/2016/03/14/opengl-fps-camera-quaternion/
Controls:
Move:
Forward - W
Backwards - S
Strafe:
Up - up arrow
Down - down arrow
Left - A
Right - D
Rotate:
Left - Q
Right - E
Zoom:
In - X
Out - Z
adopted by: Alex Zakrividoroga
'''
import numpy as np
from pyrr import Matrix44, Quaternion, Vector3, vector
import moderngl
from _example import Example
class Camera():
def __init__(self, ratio):
self._zoom_step = 0.1
self._move_vertically = 0.1
self._move_horizontally = 0.1
self._rotate_horizontally = 0.1
self._rotate_vertically = 0.1
self._field_of_view_degrees = 60.0
self._z_near = 0.1
self._z_far = 100
self._ratio = ratio
self.build_projection()
self._camera_position = Vector3([0.0, 0.0, -40.0])
self._camera_front = Vector3([0.0, 0.0, 1.0])
self._camera_up = Vector3([0.0, 1.0, 0.0])
self._cameras_target = (self._camera_position + self._camera_front)
self.build_look_at()
def zoom_in(self):
self._field_of_view_degrees = self._field_of_view_degrees - self._zoom_step
self.build_projection()
def zoom_out(self):
self._field_of_view_degrees = self._field_of_view_degrees + self._zoom_step
self.build_projection()
def move_forward(self):
self._camera_position = self._camera_position + self._camera_front * self._move_horizontally
self.build_look_at()
def move_backwards(self):
self._camera_position = self._camera_position - self._camera_front * self._move_horizontally
self.build_look_at()
def strafe_left(self):
self._camera_position = self._camera_position - vector.normalize(self._camera_front ^ self._camera_up) * self._move_horizontally
self.build_look_at()
def strafe_right(self):
self._camera_position = self._camera_position + vector.normalize(self._camera_front ^ self._camera_up) * self._move_horizontally
self.build_look_at()
def strafe_up(self):
self._camera_position = self._camera_position + self._camera_up * self._move_vertically
self.build_look_at()
def strafe_down(self):
self._camera_position = self._camera_position - self._camera_up * self._move_vertically
self.build_look_at()
def rotate_left(self):
rotation = Quaternion.from_y_rotation(2 * float(self._rotate_horizontally) * np.pi / 180)
self._camera_front = rotation * self._camera_front
self.build_look_at()
def rotate_right(self):
rotation = Quaternion.from_y_rotation(-2 * float(self._rotate_horizontally) * np.pi / 180)
self._camera_front = rotation * self._camera_front
self.build_look_at()
def build_look_at(self):
self._cameras_target = (self._camera_position + self._camera_front)
self.mat_lookat = Matrix44.look_at(
self._camera_position,
self._cameras_target,
self._camera_up)
def build_projection(self):
self.mat_projection = Matrix44.perspective_projection(
self._field_of_view_degrees,
self._ratio,
self._z_near,
self._z_far)
def grid(size, steps):
u = np.repeat(np.linspace(-size, size, steps), 2)
v = np.tile([-size, size], steps)
w = np.zeros(steps * 2)
return np.concatenate([np.dstack([u, v, w]), np.dstack([v, u, w])])
class PerspectiveProjection(Example):
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
uniform mat4 Mvp;
in vec3 in_vert;
void main() {
gl_Position = Mvp * vec4(in_vert, 1.0);
}
''',
fragment_shader='''
#version 330
out vec4 f_color;
void main() {
f_color = vec4(0.1, 0.1, 0.1, 1.0);
}
''',
)
self.camera = Camera(self.aspect_ratio)
self.mvp = self.prog['Mvp']
self.vbo = self.ctx.buffer(grid(15, 10).astype('f4'))
self.vao = self.ctx.simple_vertex_array(self.prog, self.vbo, 'in_vert')
self.states = {
self.wnd.keys.W: False, # forward
self.wnd.keys.S: False, # backwards
self.wnd.keys.UP: False, # strafe Up
self.wnd.keys.DOWN: False, # strafe Down
self.wnd.keys.A: False, # strafe left
self.wnd.keys.D: False, # strafe right
self.wnd.keys.Q: False, # rotate left
self.wnd.keys.E: False, # rotare right
self.wnd.keys.Z: False, # zoom in
self.wnd.keys.X: False, # zoom out
}
def move_camera(self):
if self.states.get(self.wnd.keys.W):
self.camera.move_forward()
if self.states.get(self.wnd.keys.S):
self.camera.move_backwards()
if self.states.get(self.wnd.keys.UP):
self.camera.strafe_up()
if self.states.get(self.wnd.keys.DOWN):
self.camera.strafe_down()
if self.states.get(self.wnd.keys.A):
self.camera.strafe_left()
if self.states.get(self.wnd.keys.D):
self.camera.strafe_right()
if self.states.get(self.wnd.keys.Q):
self.camera.rotate_left()
if self.states.get(self.wnd.keys.E):
self.camera.rotate_right()
if self.states.get(self.wnd.keys.Z):
self.camera.zoom_in()
if self.states.get(self.wnd.keys.X):
self.camera.zoom_out()
def key_event(self, key, action, modifiers):
if key not in self.states:
print(key, action)
return
if action == self.wnd.keys.ACTION_PRESS:
self.states[key] = True
else:
self.states[key] = False
def render(self, time, frame_time):
self.move_camera()
self.ctx.clear(1.0, 1.0, 1.0)
self.ctx.enable(moderngl.DEPTH_TEST)
self.mvp.write((self.camera.mat_projection * self.camera.mat_lookat).astype('f4'))
self.vao.render(moderngl.LINES)
if __name__ == '__main__':
PerspectiveProjection.run()
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