Expose functionality to generate tangents and binormals#203

Merged

pjcozzi merged 14 commits intoCesiumGS:masterfrom mlimper:master

Jan 10, 2017

+478-32

Commits on Jan 9, 2017

Merged code to expose generation of tangents and binormals
Max Limper
committed
moved tangent / binormal generation command after optimization commands
Max Limper
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proper naming for generated tangent / binormal accessors
Max Limper
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README option entry for tangents / binormals
Max Limper
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smaller changes from review
Max Limper
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replaced getPrimitives from generateNormals and generateTangentsBinormals with existing getAllPrimitives (not via nodes)
Max Limper
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added (currently unused) helper getPrimitivesFromNodes (previously in generateNormals and generateTangentsBinormals)
Max Limper
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avoiding explicit check for defined when checking tangentsBinormals option
Max Limper
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Removed unused getPrimitivesFromNodes from PrimitiveHelpers
Max Limper
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renamed binormal to bitangent throughout
Max Limper
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using Cesiums binormal attribute for bitangents for now
Max Limper
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added code to convert glTF tangents and bitangents to cesium geometry
Max Limper
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added test for generation of tangents and binormals
Max Limper
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Updated changelog (tangentsBitangents option)
Max Limper
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