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Preprints, Working Papers, ... Year : 2017

Computing a front-facing ellipse that subtends the same solid angle as an arbitrarily oriented ellipse

Abstract

A front-facing ellipse, with respect to an observation point, is an ellipse that is perpendicular to the line that goes through the origin and the center of the ellipse. Front-facing ellipses are more convenient than arbitrarily oriented ellipses for solid-angle computations. In this report, we present an algebraic method for computing a front-facing ellipse that covers the same solid angle as an arbitrarily oriented ellipse. A previous approach was described by Conway [Con10] but it is involved, in terms of trigonometric derivations and computations. Our formulation shows that this problem is equivalent to computing the eigenvectors of a 3×3 matrix, which is simpler to derive and compute.
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Dates and versions

hal-01561624 , version 1 (13-07-2017)

Identifiers

  • HAL Id : hal-01561624 , version 1

Cite

Eric Heitz. Computing a front-facing ellipse that subtends the same solid angle as an arbitrarily oriented ellipse. 2017. ⟨hal-01561624⟩
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