	Undesired Outcome	Intended Outcome
Returns	The bottom side of the entity cannot be extruded.	An extrusion is created on every side of the entity.
Procedures
Explanations	Bug occured as the `pgon` created in the 2nd line of code is facing the positive Z direction. As seen in the image below, the polygon has its front(white) surface facing up and back(gray) surface facing down. As such, the normal of `pgon` along which the extrusion will take place is pointing in the positive Z direction. Thus, `pgon` is extruded upwards and the extruded polygons are hidden from sight by the other polygons.	Debug by reversing the surface of the `pgon` created in the 2nd line of code. This will allow the surface to be facing downwards and the extrusion of the polygon will be in the negative Z direction.

	Undesired Outcome	Intended Outcome
Returns	Rectangular pattern generated is of the surface of the polygon.	A rectangular pattern is created on the surface of a polygon.
Procedures
Explanations	Bug occurred because the user did not realise that if the normal of the entity is not provided, the function will assume that the entity created is facing the Z direction. In the case of this example, `cen` in the function pattern.Rectangle is a coordinate on `ex[0]` and does not provide the normal of the pattern, hence the pattern created is facing the Z direction.	Debug by using the function virtual.GetPlane which returns both the coordinates of the centroid and the normal of `ex[0]`. Inputting `pln` into pattern.Rectangle will enable the pattern to be created facing the intended direction.

Direction of Normal

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