Is there a feature or library in HTML5's SVG that allows for hidden surface removal?

While exploring HTML5, I came across the difference between SVG and Canvas – SVG being declarative and Canvas being imperative. It got me thinking about a more advanced declarative technology that could define shapes, specify a viewpoint, and let the browser handle hidden surface removal.

I tried searching online but didn't come up with much except for this link, which wasn't very helpful.

Is there a javascript library available for performing hidden surface removal on a new extended standard in development?

For instance, I would like to define a cube with 12 edges, set specific opacity levels for surfaces (instead of wireframing), and instruct the browser not to display the "back" surfaces.

Answer №1

When it comes to rendering 3D graphics, there are two key approaches. The first method involves rendering each triangle or quad from back to front.

To achieve this, one can calculate the center of a shape by averaging the positions of its vertices. The triangles can then be sorted based on their z coordinates and rendered in the correct order.

The second solution addresses the issue you're concerned with. It requires calculating normal vectors using cross products of two side vectors. When drawing a cube, the dot product of the triangle's normal and the camera's direction vector is computed. If this value is less than or equal to 0 (indicating an angle greater than 90° between the two vectors), the triangle should not be drawn.

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