I want to import my mesh(.obj) into Unity.
But when i imported my mesh into Unity, i couldn’t find my mesh on scene.
I heard that obj file is wound by right-handed coordinate system.
Actually, It’s not sure whether not showing mesh on Unity Scene is due to coordinate system problems.
But i’m going to try to convert it.
How can i convert from right-handed coordinate system to left-handed coordinate system?
And Why doesn’t the mesh appear on unity scene?
I am new to this program(Unity)…
Please help me…!!
There is not one valid way how to convert from a right handed system to a left handed system as there are multiple in each category. In general one of the axis need to be inverted. At the same time when an axis is inverted the winding order or the triangles need to be changed as well, otherwise they face the wrong direction. However when you import an external format you have to pay attention to the used winding order anyways because the winding order is not always the same. In Unity a clockwise ordering denotes the front face.
As I said there’s not one valid way how to convert between two coordinate spaces in general. Concepts like “up”, “right” and “forward” depend on the used convention. Some righthanded systems have the x-y plane as the ground plane and z is pointing up. Others have a similar layout as Unity has but the z axis points backwards instead of forwards (the usual mathematical convention).
In many cases you can choose the export conventions during export in your modelling software. So the import depends on many factors.