Computer Graphics from Scratch by Gabriel Gambetta

Author:Gabriel Gambetta [Gabriel Gambetta]
Language: eng
Format: epub, pdf
Publisher: No Starch Press
Published: 2021-05-18T00:00:00+00:00

Projecting Our First 3D Object

This means we can go ahead and draw our first 3D object: a cube. We define the coordinates of its 8 vertices, and we draw line segments between the projections of the 12 pairs of vertices that make the edges of the cube, as seen in Listing 9-1.

ViewportToCanvas(x, y) {

return (x * Cw/Vw, y * Ch/Vh);

}

ProjectVertex(v) {

return ViewportToCanvas(v.x * d / v.z, v.y * d / v.z)

}

// The four "front" vertices

vAf = [-1, 1, 1]

vBf = [ 1, 1, 1]

vCf = [ 1, -1, 1]

vDf = [-1, -1, 1]

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