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83 lines
2.1 KiB
83 lines
2.1 KiB
1 year ago
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#include <igl/readOFF.h>
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#include <igl/opengl/glfw/Viewer.h>
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#include <iostream>
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#include <igl/stb/write_image.h>
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#include <igl/stb/read_image.h>
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// This function is called every time a keyboard button is pressed
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bool key_down(igl::opengl::glfw::Viewer& viewer, unsigned char key, int modifier)
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{
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if (key == '1')
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{
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// Allocate temporary buffers
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> R(1280,800);
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> G(1280,800);
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> B(1280,800);
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> A(1280,800);
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// Draw the scene in the buffers
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viewer.core().draw_buffer(
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viewer.data(),false,R,G,B,A);
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// Save it to a PNG
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igl::stb::write_image("out.png",R,G,B,A);
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}
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if (key == '2')
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{
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// Allocate temporary buffers
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> R,G,B,A;
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// Read the PNG
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igl::stb::read_image("out.png",R,G,B,A);
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// Replace the mesh with a triangulated square
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Eigen::MatrixXd V(4,3);
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V <<
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-0.5,-0.5,0,
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0.5,-0.5,0,
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0.5, 0.5,0,
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-0.5, 0.5,0;
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Eigen::MatrixXi F(2,3);
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F <<
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0,1,2,
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2,3,0;
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Eigen::MatrixXd UV(4,2);
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UV <<
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0,0,
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1,0,
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1,1,
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0,1;
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viewer.data().clear();
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viewer.data().set_mesh(V,F);
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viewer.data().set_uv(UV);
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viewer.core().align_camera_center(V);
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viewer.data().show_texture = true;
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// Use the image as a texture
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viewer.data().set_texture(R,G,B);
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}
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return false;
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}
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int main(int argc, char *argv[])
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{
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// Load a mesh in OFF format
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Eigen::MatrixXd V;
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Eigen::MatrixXi F;
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igl::readOFF(TUTORIAL_SHARED_PATH "/bunny.off", V, F);
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std::cerr << "Press 1 to render the scene and save it in a png." << std::endl;
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std::cerr << "Press 2 to load the saved png and use it as a texture." << std::endl;
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// Plot the mesh and register the callback
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igl::opengl::glfw::Viewer viewer;
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viewer.callback_key_down = &key_down;
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viewer.data().set_mesh(V, F);
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viewer.launch();
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}
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