opengl es - Box polygon rendering w/ normals showing weird lighting/coloring -



opengl es - Box polygon rendering w/ normals showing weird lighting/coloring -

basically, have 2 triangles appear different in color (looks lighting issue due wrong normals). don't think case...

details

i have simple cube (box), each face composed of 6 vertices using vertex buffer (i not using index buffer @ moment).

in add-on vertices have defined normal values each face.

however, appears wrong either normals (which don't think there issue with) and/or lighting.

each face drawn using webgl.drawarrays using triangle_strip. image showing front end face of cube. next vertices (note origin top-left corner of front end face):

0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0

the next normals:

0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1

question

any ideas why 1st triangle lighter in color 2nd triangle?

the trick triangle strip each additional triangle gets 1 additional vertex 3 normal vectors. guess not specifying plenty normal vectors or specifying many vertices.

opengl-es webgl

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