StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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41 lines
1.3 KiB
41 lines
1.3 KiB
4 years ago
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module.exports = perspectiveFromFieldOfView;
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/**
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* Generates a perspective projection matrix with the given field of view.
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* This is primarily useful for generating projection matrices to be used
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* with the still experiemental WebVR API.
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*
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* @param {mat4} out mat4 frustum matrix will be written into
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* @param {number} fov Object containing the following values: upDegrees, downDegrees, leftDegrees, rightDegrees
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* @param {number} near Near bound of the frustum
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* @param {number} far Far bound of the frustum
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* @returns {mat4} out
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*/
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function perspectiveFromFieldOfView(out, fov, near, far) {
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var upTan = Math.tan(fov.upDegrees * Math.PI/180.0),
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downTan = Math.tan(fov.downDegrees * Math.PI/180.0),
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leftTan = Math.tan(fov.leftDegrees * Math.PI/180.0),
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rightTan = Math.tan(fov.rightDegrees * Math.PI/180.0),
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xScale = 2.0 / (leftTan + rightTan),
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yScale = 2.0 / (upTan + downTan);
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out[0] = xScale;
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out[1] = 0.0;
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out[2] = 0.0;
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out[3] = 0.0;
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out[4] = 0.0;
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out[5] = yScale;
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out[6] = 0.0;
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out[7] = 0.0;
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out[8] = -((leftTan - rightTan) * xScale * 0.5);
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out[9] = ((upTan - downTan) * yScale * 0.5);
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out[10] = far / (near - far);
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out[11] = -1.0;
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out[12] = 0.0;
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out[13] = 0.0;
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out[14] = (far * near) / (near - far);
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out[15] = 0.0;
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return out;
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}
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