c++ - 旋转模型矩阵时的形状变形

Question

我正在尝试将 glm 库与 openGL 结合使用来旋转形状。不幸的是，当我尝试使用 glm::rotate() 旋转形状时，我的形状尺寸会被拉伸(stretch)。除此之外，形状围绕一个看似随机的点旋转。一切都是二维的。
顶点着色器代码:

#version 330 core

layout(location = 0) in vec2 pos;
uniform mat4 model;
uniform mat4 projection;
uniform mat4 view;

void main()
{
    gl_Position = projection * view * model * vec4(pos.x, pos.y, 1.0f, 1.0f);
}

型号矩阵代码:

m_angle = angle;
m_modelMatrix = glm::rotate(glm::mat4(1.0f), glm::radians((float)m_angle), glm::vec3(0, 0, 1));

投影和查看矩阵代码:

glm::mat4 proj = glm::mat4(1.0f);
glm::mat4 view = glm::mat4(1.0f);
proj = glm::perspective(glm::radians(53.f), 1.f, 0.1f, 100.f);
view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));    

Answer 1

问题是由于投影矩阵不考虑视口(viewport)的纵横比引起的。在您的代码中，方面参数为 1.0:

proj = glm::perspective(glm::radians(53.f), 1.f, 0.1f, 100.f);

aspect 参数必须是 viewprot 窗口的宽度和高度的比率:

float aspect = (float)window_width/(float)window_height;
proj = glm::perspective(glm::radians(53.f), aspect, 0.1f, 100.f);