for the life of me I cannot find an answer to this seemingly easy operation. In CAD there's this command called "align" where I can simply align points on a polygon to the other points of a polygon, thus perfectly aligning the 2 faces together. However I just simply cannot do that in blender. I have tried snapping with all kinds of options on, changing the normals or the object, resetting the origin point, using different addons (works but very unreliable). I must be missing something very fundamental. A simple example is this: how do I perfectly align the blue face of that triangle tot the blue face of that square? Both are rotated randomly. I want the result to be the triangle over the square, in the square's orientation.