TDT4195/OpenGL_Intro
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fix: apply correct model, view, and projection matrices for camera motion each frame

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Adrian Gunnar Lauterer
2025-09-17 22:38:35 +02:00
parent 861c6ebd62
commit de7cc20db3
1 changed files with 19 additions and 13 deletions
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32
src/main.rs
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@@ -308,28 +308,34 @@ fn main() {
// == // Issue the necessary gl:: commands to draw your scene here
simple_shader.activate();
// build and send the transform matrix (start from identity)
let mut transform: glm::Mat4 = glm::identity();
// build Model matrix (start from identity)
let mut model: glm::Mat4 = glm::identity();
// cycle through each transform parameter (a,b,c,d,e,f) over time
let cycle_duration = 2.0;
let idx = ((elapsed / cycle_duration).floor() as usize) % 6;
let v = elapsed.sin();
match idx {
0 => transform[(0,0)] = v, // a
1 => transform[(0,1)] = v, // b
2 => transform[(0,3)] = v, // c
3 => transform[(1,0)] = v, // d
4 => transform[(1,1)] = v, // e
5 => transform[(1,3)] = v, // f
0 => model[(0,0)] = v, // a
1 => model[(0,1)] = v, // b
2 => model[(0,3)] = v, // c
3 => model[(1,0)] = v, // d
4 => model[(1,1)] = v, // e
5 => model[(1,3)] = v, // f
_ => {}
}
// move scene into viewable negative z range
let translation: glm::Mat4 = glm::translation(&glm::vec3(0.0, 0.0, -5.0));
transform = translation * transform;
// apply perspective projection: (aspect, fovy radians, near, far)
// model translation to initial view distance
let translation_model: glm::Mat4 = glm::translation(&glm::vec3(0.0, 0.0, -5.0));
let model = translation_model * model;
// build View matrix: translate and rotate world relative to camera
let view_translation: glm::Mat4 = glm::translation(&(-cam_pos));
let view_rot_y: glm::Mat4 = glm::rotation(-cam_yaw, &glm::vec3(0.0, 1.0, 0.0));
let view_rot_x: glm::Mat4 = glm::rotation(-cam_pitch, &glm::vec3(1.0, 0.0, 0.0));
let view: glm::Mat4 = view_rot_x * view_rot_y * view_translation;
// build Projection matrix
let projection: glm::Mat4 =
glm::perspective(window_aspect_ratio, std::f32::consts::PI / 4.0, 1.0, 100.0);
transform = projection * transform;
// final transform: Projection * View * Model
let transform: glm::Mat4 = projection * view * model;
gl::UniformMatrix4fv(transform_loc, 1, gl::FALSE, transform.as_ptr());
gl::BindVertexArray(my_vao);
gl::DrawElements(