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Add Quaternion interpolation

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glm made this quite easy!
This commit is contained in:
karl 2020-10-02 22:27:12 +02:00
parent 9125e7a3cc
commit aef495a394
2 changed files with 31 additions and 5 deletions
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30
ECS/Systems/PathMoveSystem.h
View File

@ -112,7 +112,6 @@ class PathMoveSystem : public EntitySystem, public EventSubscriber<InputEvent> {
p3 = p2 + interp_direction * 2.0f;
} else {
// We're fine - use the point after the target for p3
p2 = path.points[pathmove->current_point_index + 1];
p3 = path.points[pathmove->current_point_index + 2];
}
@ -140,7 +139,34 @@ class PathMoveSystem : public EntitySystem, public EventSubscriber<InputEvent> {
// Rotation
// https://www.3dgep.com/understanding-quaternions/#SQUAD
PathMove::Views views = pathmove->views;
transform->set_rotation_from_quat(views.views[pathmove->current_point_index]);
// Similar procedure as with position to get the relevant values
glm::quat q0;
glm::quat q1 = views.views[pathmove->current_point_index];
glm::quat q2 = views.views[pathmove->current_point_index + 1];
glm::quat q3;
if (pathmove->current_point_index == num_points - 2) {
// Interpolate what q3 would be if the change from q1 to q2 continues
q3 = glm::fastMix(q1, q2, 2.0f);
} else {
// We're fine - use the point after the target for p3
q3 = views.views[pathmove->current_point_index + 2];
}
if (pathmove->current_point_index == 0) {
// Interpolate what q0 would be if the same change happened from q0 to q1 as from q1 to q2
q0 = glm::fastMix(q1, q2, -1.0f);
} else {
// We're fine - use the point before the current point
q0 = views.views[pathmove->current_point_index - 1];
}
// Interpolate
glm::quat result = glm::squad(q1, q2, glm::intermediate(q0, q1, q2), glm::intermediate(q1, q2, q3), pathmove->time_passed);
// Apply
transform->set_rotation_from_quat(result);
});
}

6
main.cpp
View File

@ -101,12 +101,12 @@ int main() {
glm::vec3(0.0, 2.0, -10.0)
}),
PathMove::Views(std::vector<glm::quat>{
glm::quat(0.0, 0.0, 0.0, 0.0),
glm::angleAxis(glm::radians(-10.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(0.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(10.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(20.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(40.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(90.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(95.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(120.f), glm::vec3(0.f, 1.f, 0.f)),
glm::angleAxis(glm::radians(180.f), glm::vec3(0.f, 1.f, 0.f))
})
);