83 lines
1.4 KiB
C++
83 lines
1.4 KiB
C++
#ifndef CYLINDER_H
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#define CYLINDER_H
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#include "../../../math/Matrix4.h"
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#include "Mesh.h"
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namespace Ray3D {
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/** walled cylinder */
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class Cylinder : public Mesh {
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public:
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/** ctor */
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Cylinder() {
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;
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}
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/** get a transformed version */
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Cylinder transformed(const Matrix4& mat) const {
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Cylinder res = *this;
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res.transform(mat);
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return res;
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}
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/** build */
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void add(const float rOuter, const float h, bool topAndBottom) {
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const int tiles = 8;
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const float deg_per_tile = 360.0f / tiles;
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const float rad_per_tile = deg_per_tile / 180.0f * M_PI;
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for (int i = 0; i < tiles; ++i) {
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const float startRad = (i+0) * rad_per_tile;
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const float endRad = (i+1) * rad_per_tile;
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const float xo0 = std::cos(startRad) * rOuter;
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const float yo0 = std::sin(startRad) * rOuter;
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const float xo1 = std::cos(endRad) * rOuter;
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const float yo1 = std::sin(endRad) * rOuter;
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const float cx = 0;
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const float cy = 0;
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// outer
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addQuad(
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Point3(xo0, yo0, -h),
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Point3(xo1, yo1, -h),
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Point3(xo1, yo1, +h),
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Point3(xo0, yo0, +h)
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);
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if (topAndBottom) {
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// top
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addTriangle(
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Point3(cx, cy, h),
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Point3(xo0, yo0, h),
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Point3(xo1, yo1, h)
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);
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// bottom
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addTriangle(
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Point3(cx, cy, -h),
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Point3(xo1, yo1, -h),
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Point3(xo0, yo0, -h)
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);
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}
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}
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}
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};
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}
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#endif // CYLINDER_H
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