(an invalid combination would be something paradoxal like : Z Up, Z Forward). However, that's not universal, so the fbx exporter allow every valid Up/Forward combination. It's quite conventional that the vertical axis points up (not down), and the X axis points right (not left). I've got some fbx files which are normally on the side with baked conversion it's on the other side. Of course it opposes to right-handed coordinates where the 'Y-finger' would point forward. 842 There should be an option which axis to convert, though. Sometime this kind of orientation is called 'left-handed coordinates' : In Blender if you turn the view so the Z axis points up, and the X Axis points right, then the Y axis points backward in other terms, the -Y axis points forward. Once you know which axis means vertical, you need to determine how the two other axis are oriented. In many other software like Unity, the vertical axis is called Y (so X and Z define the floor plane). In Blender, the vertical axis is called Z (so X and Y define the floor plane). That doesn't change anything while your working into a soft, but can be problematic when you export models and animations. In the first image from Blender you can see that my cup handle pointed along the x axis aka right, but now is facing left (-X direction).Each software handle axis names/orientation differently. Blenders FBX exporter tags the file with Blenders unit scale and expected axes orientation, which Unity handles differently than an FBX file from Maya. When imported into Unity, my model is facing upwards as expected along the Y axis.īut, what I don't understand is why my model is also rotated 180 degrees around the Y axis? I export my model using Blenders built-in FBX exporter with the default settings (UP = Y axis and FORWARD = -Z axis).

Now when working in Blender if you want to use Z as the UP vector, you simply transform your model by a positive 90 degree rotation around X (but don't apply the rotation).

model your 3D model in Blender along the Y axis and apply the necessary rotation onto the model.

Now, if you want a model who is facing up in Blender (along Z) to be facing up in Unity (along Y) when imported, people recommend this simple fix: When exporting models from Blender into Unity one must take into account the handedness of both programs.īlender considers Z vector as the UP vector, but Unity considers the Y vector as the UP.

Blender fbx export settings unity