| 21. | In the case of differential curves, the curvature vector is a normal vector of special interest.
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| 22. | The vector is e . g . the normal vector of a plane mirror in three dimensions.
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| 23. | This means that at some junction between two pieces we will have normal vectors pointing in opposite directions.
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| 24. | The direction of a reflected ray is determined by the vector of incidence and the surface normal vector.
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| 25. | In effect, a point rotated around its normal vector will not change the way it reflects light.
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| 26. | Horocycles correspond to the motion of the normal vectors of a horosphere on the upper half-plane.
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| 27. | In rendering, also the normal vector \ boldsymbol { n } to the surface is often needed.
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| 28. | Dividing this vector by its length yields a unit normal vector to the parametrised surface at a regular point:
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| 29. | The relationship of these, of corse would be to calculate the Normal Vector of the curvature of the surface.
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| 30. | They are normal vector can be expressed as a linear combination of two future directed null vectors, normalised by:
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