surface-vectors v0.0.0

surface-vectors

Debug utility for drawing surface vectors in WebGL.

Useful for visualising normal/tangent/bitangent vectors across a mesh's surface.

Usage

If you're looking for a complete usage example, check out the demo and its source code.

sv = surfaceVectors(gl, cells, positions, vectors)

Prepare a pair of positions and vectors for rendering.

• gl is the WebGL canvas context.
• cells should be a list of element/face indices for your model: either a packed Float32Array, or a nested 2D array. See the bunny module's data for an example of this.
• positions should a list of positions for your model: again, in either of the above formats.
• vectors same format as positions and cells, instead containing the vectors to render from each point at the same index in positions.

sv.render(length, matrix, color)

Draws the vectors to the screen.

• length is the length at which to draw each vector.
• matrix the matrix to multiply each position by. Ordinarily, you'd want this to be Projection View Model, like you would normally do shader-side.
• color the color to use when drawing the vectors: a 3-element long array, and should contain RGB values from 0 to 1.

License

MIT. See LICENSE.md for details.