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Quaternion dot product?
Jack Digeridoo
machinimaniac
Join date: 29 Jul 2003
Posts: 1,170
04-01-2005 17:21
Does LSL have a way to get quaternion dot product's? I don't know math at all but I found some C code I want to use takes the dot product of quat's. The code expects a float as a result so I guess it's not the same as multiplying to rotations together...
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Jeffrey Gomez
Cubed™
Join date: 11 Jun 2004
Posts: 3,522
04-01-2005 19:24
Huh. This one I had to look up. This look right?

CODE
default
{
    state_entry()
    {
        //q1 dot q2 equals: s1s2 + v1 dot v2

        //Therefore.
        rotation one = <0,0,0,1>;
        rotation two = <1,0,0,0>;
        
        float dot = one.s * two.s;
        dot += (one.x * two.x) + (one.y * two.y) + (one.z * two.z);
    }
}

Found the definition of the quat dot here. Vector dot (which I should have remembered) found here.
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