47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
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#include "quad_patch.h"
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MyMesh quad_patch(MyQuad q, MyMesh mesh, VertexHandle vh) {
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MyMesh patch;
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Eigen::Vector3d point
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(mesh.point(vh)[0], mesh.point(vh)[1], mesh.point(vh)[2]);
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Eigen::Transform<double, 3, Eigen::Affine> ch_base = q._r * q._t;
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Eigen::Transform<double, 3, Eigen::Affine> inv_ch_base = ch_base.inverse();
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point = ch_base * point;
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double xmin = point[0], xmax = point[0];
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double ymin = point[1], ymax = point[1];
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for (VertexHandle vi : mesh.vv_range(vh)) {
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Eigen::Vector3d point
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(mesh.point(vi)[0], mesh.point(vi)[1], mesh.point(vi)[2]);
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point = ch_base * point;
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xmin = std::min(xmin, point[0]);
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xmax = std::max(xmax, point[0]);
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ymin = std::min(ymin, point[1]);
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ymax = std::max(ymax, point[1]);
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}
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double xstep = (xmax-xmin)/64.;
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double ystep = (ymax-ymin)/64.;
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for (size_t y = 0; y < 64; y++) {
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for (size_t x = 0; x < 64; x++) {
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double dx = xmin + x * xstep;
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double dy = ymin + y * ystep;
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Eigen::Vector3d point(dx, dy, -q.quad_fun(dx, dy));
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point = inv_ch_base * point;
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patch.new_vertex(Point(point[0], point[1], point[2]));
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}
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}
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for (VertexHandle vhi : patch.vertices()) {
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patch.set_color(vhi, MyMesh::Color(0, 1, .2));
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size_t i = vhi.idx();
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size_t x = i % 64;
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size_t y = i / 64;
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if (x == 63 || y == 63) continue;
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patch.add_face(vhi, patch.vertex_handle(i + 64),
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patch.vertex_handle(i + 1));
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patch.add_face(patch.vertex_handle(i + 1),
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patch.vertex_handle(i + 64),
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patch.vertex_handle(i + 65));
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}
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return patch;
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}
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