matrix - gl_ModelViewMatrixInverseTranspose in threejs -

in attemp write own custom shader (i using three.shadermaterial), need set webgl's built-in gl_modelviewmatrixinversetranspose uniform (as seen on http://mew.cx/glsl_quickref.pdf). noticed uniforms automatically passed shader, instance gl_modelviewmatrix , gl_projectionmatrix accounted for, threejs' modelviewmatrix , projectionmatrix respectively. gl_modelviewprojectionmatrix, on other hand, seems missing, noticed examples can computed inside shader projectionmatrix * modelviewmatrix. question is: manually compute gl_modelviewmatrixinversetranspose inside shader starting modelviewmatrix (and if so, how?) or there unform (possibily merged inside definition of three.shadermaterial three.uniformsutils.merge) handles it? cheers.

in three.js shader inverse transpose of modelviewmatrix called normalmatrix.

it automatically passed shaders don't need work it.

// = inverse transpose of modelviewmatrix uniform mat3 normalmatrix; 

for reference here built-in uniform , attributes three.js has.