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PO3-D semi-circle with canvas
 

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  1. PO3-D semi-circle with canvas
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    <p>I have a library of shapes with indicies and vertices that are functions and want to create a 3-D semi-sphere. But I am Having trouble with this. See below of sample 3-D sphere function. How can I create a 3-D semi-sphere function the same way? Please help!</p> <pre><code>sphere: function (spherical) { var radius = 0.5, theta = Math.PI, phi = 2 * Math.PI, latLines = 30, longLines = 30, currentLat, currentLong, currentVertex, currentIndex, vertices = [], indices = [], finalResult = {}, i, j, t, m; for (i = 0; i &lt; (latLines + 1); i += 1) { currentLat = i * theta / latLines; for (j = 0; j &lt; (longLines + 1); j += 1) { currentVertex = latLines * i + j; vertices[currentVertex] = []; currentLong = j * phi / longLines; vertices[currentVertex][0] = radius * Math.sin(currentLat) * Math.cos(currentLong); vertices[currentVertex][1] = radius * Math.cos(currentLat); vertices[currentVertex][2] = radius * Math.sin(currentLat) * Math.sin(currentLong); if (spherical) { vertices[currentVertex][0] *= (currentLat * spherical); vertices[currentVertex][2] *= (currentLat * spherical); } } } for (t = 0; t &lt; (latLines + 1); t += 1) { for (m = 0; m &lt; (longLines + 1); m += 1) { currentIndex = 2 * ((latLines + 1) * t + m); indices[2 * ((latLines + 1) * t + m)] = []; indices[2 * ((latLines + 1) * t + m) + 1] = []; indices[currentIndex][0] = longLines * t + m; indices[currentIndex][1] = longLines * t + m + 1; indices[currentIndex][2] = longLines * (t + 1) + m; currentIndex += 1; indices[currentIndex][0] = longLines * (t + 1) + m; indices[currentIndex][1] = longLines * (t + 1) + m + 1; indices[currentIndex][2] = longLines * t + m + 1; } } finalResult.vertices = vertices; finalResult.indices = indices; return finalResult; }, </code></pre>
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    1. USFrank B
    1. USuser1585646
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    1. COI haven't tried your function (it looks like calculating vertices for a sphere), but I don't see the need for such routine. By "semicircle" you mean an arc with length Math.PI? If so, look at http://jsfiddle.net/8Cqc9/
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      1. PO3-D semi-circle with canvas
      1. USsixFingers
    2. CO@sixFingers yes it does calculate vertices for a sphere is there a way I can do this for a semi-circle. This is for a 3-D scene not 2-D.
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      1. PO3-D semi-circle with canvas
      1. USuser1585646
    3. COSo do you want a semi-circle or a semi-sphere?
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      1. USFrank B
 

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