Examples: Clean up.

[linbingquan]

Related issue: #XXXX

Description

Removed useless code.

I think it is useless. There's judgment here, like:

three.js/src/core/BufferGeometry.js

Line 64 in ca9ff0f

this.index = new ( arrayNeedsUint32( index ) ? Uint32BufferAttribute : Uint16BufferAttribute )( index, 1 );

If this isn't right, Please tell me.

I will close this PR. Thanks.

[Mugen87]

This line is a leftover from the original code which created an index buffer based on Uint16Array. As you pointed out correctly, BufferGeometry.setIndex() is more variable and picks an optimal array type based on the index data.