我试图独立旋转 2 个对象,但是当我运行代码时,两个对象以相同的方向旋转。
这里我保存矩阵并在立方体下旋转一个正方形:
def rotate_square():
glColor3f(1,1,1)
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glRotatef(45,0,1,0)
glBegin(GL_LINES)
glVertex3fv(v1);
glVertex3fv(v2);
glVertex3fv(v1);
glVertex3fv(v3);
glVertex3fv(v3);
glVertex3fv(v4);
glVertex3fv(v2);
glVertex3fv(v4);
glEnd()
glPopMatrix()
主要功能:
def main():
pygame.init()
screen = pygame.display.set_mode(SCREEN_SIZE, DOUBLEBUF|OPENGL)
resize(*SCREEN_SIZE)
print(glGetString(GL_VERSION))
gluLookAt(0, 0, -6, 0, 0, 0, 0, 1, 0)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
旋转立方体:
glRotatef(1,0,1,0)
glutWireCube(2)
rotate_square()
pygame.display.flip()
pygame.time.wait(10)
请注意,通过
glBegin
/glEnd
序列进行绘制、固定功能管道矩阵堆栈和每个顶点光照模型的固定功能管道,几十年来已被弃用。
阅读固定函数管道并参阅顶点规范和着色器了解最先进的渲染方式。
无论如何,通常一个对象是通过模型矩阵进行变换的,然后场景是通过视图矩阵和投影矩阵进行变换的。
遗憾的是,在已弃用的 OpenGL 固定函数管道中,模型矩阵和视图矩阵是连接在一起的,无法那么容易地单独处理。
您必须通过每个对象自己的模型矩阵来变换它们才能独立旋转它们。创建 4*4 矩阵并通过单位矩阵初始化它们:
model1 = [[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]
model2 = [[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]
glLoadMatrix
将它们加载到矩阵堆栈中。然后操作它们,最后通过 glGetFloatv(GL_MODELVIEW_MATRIX)
: 读取结果
glPushMatrix()
glLoadMatrixf(model1)
glRotatef(1,0,1,0)
model1 = glGetFloatv(GL_MODELVIEW_MATRIX)
glPopMatrix()
glMultMatrix
:
glPushMatrix()
glMultMatrixf(model1)
glutWireCube(2)
glPopMatrix()
最终代码可能如下所示:
model1 = [[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]
model2 = [[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]
def rotate_square():
global model2
glPushMatrix()
glLoadMatrixf(model2)
glRotatef(5,0,1,0)
model2 = glGetFloatv(GL_MODELVIEW_MATRIX)
glPopMatrix()
glColor3f(1,1,1)
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glMultMatrixf(model2)
glBegin(GL_LINES)
glVertex3fv(v1)
glVertex3fv(v2)
glVertex3fv(v1)
glVertex3fv(v3)
glVertex3fv(v3)
glVertex3fv(v4)
glVertex3fv(v2)
glVertex3fv(v4)
glEnd()
glPopMatrix()
def main():
global model1
# [...]
while True:
# [...]
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glLoadMatrixf(model1)
glRotatef(1,0,1,0)
model1 = glGetFloatv(GL_MODELVIEW_MATRIX)
glPopMatrix()
glPushMatrix()
glMultMatrixf(model1)
glutWireCube(2)
glPopMatrix()
rotate_square()
pygame.display.flip()
pygame.time.wait(10)