[x3d-public] Calculation of normal from normalTexture.

[Holger Seelig]

Looking at X3DOneSidedMaterialNode https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/shape.html#X3DOneSidedMaterialNode <https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/shape.html#X3DOneSidedMaterialNode> I can find there the calculation of the normal as following: 

normal.xyz = normalize((textureSample(normalTexture).rgb * vec3(2,2,2) - vec3(1,1,1)) * vec3(normalScale, normalScale, 1))

Think the handling of normalScale is wrong, the vector must include 3 times normalScale, not z equal 1, like so:

vec3(normalScale, normalScale, normalScale)

The second issue I notices is that the normalScale is applied before normalization, but that means that it has not effect. Normalization means multiplying the vector with a factor, so that the length of the vector is one (1), this makes the multiplication with the normalScale factor undone.

Best regards,
Holger.

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