Electronic Arts Interview Question for Software Engineer / Developers






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Fair question.

Dot product is used to check if 2 vectors are orthogonal.

Cross product is used to find a 3D vector orthogonal to 2 other 3D vectors. Cross-product only works in 3D.

- Jack March 10, 2006 | Flag Reply
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The alternate version of the cross product absinTheta can be used to find the area of a quadrilateral.

- Jack March 13, 2006 | Flag Reply
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|a||b|sinTheta

- Jack March 13, 2006 | Flag Reply
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The cross product of two vectors gives you a vector normal to them, and then taking a dot product with another vector gives you the projection of that vector on the normal vector

- Sakib February 14, 2007 | Flag Reply
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That's funny, because wikipedia says it is |a||b|cos(theta)

- Anonymous June 07, 2007 | Flag Reply
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en.wikipedia.org/wiki/Cross_product#Definition

This seems to be A.B.sin( theta )

- brainydexter April 29, 2010 | Flag Reply
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dot product is used to get the effective lighting per pixel/vertex provided the normal of the current face and the lighting direction.

- Ravi September 06, 2011 | Flag Reply


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