ImGuizmo doesn't detect mouse movement about imguizmo

[CedricGuillemet]

ImGuizmo uses mouse position reported by imgui. Usualy, when I get mouse position issues, it's because of inverted Y. Do you get a detection when you mouse the mouse verticaly?
For the matrix, maybe you matrix is row major instead of column major. Did you try to use an identity matrix?

[mel-florance]

Hello,

First of all thanks a lot, after some research with your answer i managed to get it to work like a charm !

Indeed i found that the gizmo can get flipped on the Y axis (up) when the fov has a bad value like 60, so i managed to fix that issue by using the glm::perspectiveFov method with a fov in radians, and then i flipped each axis manually.

Then i also noticed that i wasn't updated the transform of my object properly (which requires to update the position, rotation and scale of my transform (which is then converted back to my engine to a matrix for parenting and stuff)).

Here the final code i used, if it can help someone else:

ImGuizmo::SetDrawlist();
ImGuizmo::SetRect(rect_pos.x, rect_pos.y, size.x, size.y - 22.0f);

Node* node = editor->getEngine()->getScenesManager()->getActiveScene()->getSceneGraph()->getNodes()[1];
glm::mat4 proj = glm::perspectiveFov(cam->getFov(), size.x, size.y, cam->getClipNear(), cam->getClipFar());
glm::mat4 view = cam->getViewMatrix();
glm::mat4 object = node->transform.getMatrix();

view[0][1] = -view[0][1];
view[1][1] = -view[1][1];
view[2][1] = -view[2][1];
			
ImGuizmo::Manipulate(
    glm::value_ptr(view),
    glm::value_ptr(proj),
    ImGuizmo::TRANSLATE, 
    ImGuizmo::LOCAL,  
    &object[0][0]
);

float matrixTranslation[3], matrixRotation[3], matrixScale[3];
ImGuizmo::DecomposeMatrixToComponents(&object[0][0], matrixTranslation, matrixRotation, matrixScale);

node->transform.setPosition(glm::vec3(matrixTranslation[0], matrixTranslation[1], matrixTranslation[2]));
node->transform.setRotation(glm::vec3(glm::radians(matrixRotation[0]), glm::radians(matrixRotation[1]), glm::radians(matrixRotation[2])));
node->transform.setScale(glm::vec3(matrixScale[0], matrixScale[1], matrixScale[2]));