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// ----------------------------------------------------------------------------
// - Open3D: www.open3d.org -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
#include "open3d/Open3D.h"
#include "open3d/visualization/rendering/Camera.h"
#include "open3d/visualization/rendering/filament/FilamentEngine.h"
#include "open3d/visualization/rendering/filament/FilamentRenderer.h"
using namespace open3d;
using namespace open3d::visualization::gui;
using namespace open3d::visualization::rendering;
// Headless rendering requires Open3D to be compiled with OSMesa support.
// Add -DENABLE_HEADLESS_RENDERING=ON when you run CMake.
static const bool kUseHeadless = false;
static const std::string kOutputFilename = "offscreen.png";
int main(int argc, const char *argv[]) {
const int width = 640;
const int height = 480;
auto &app = Application::GetInstance();
app.Initialize(argc, argv);
if (kUseHeadless) {
EngineInstance::EnableHeadless();
}
auto *renderer =
new FilamentRenderer(EngineInstance::GetInstance(), width, height,
EngineInstance::GetResourceManager());
auto *scene = new Open3DScene(*renderer);
MaterialRecord mat;
mat.shader = "defaultLit";
auto torus = open3d::geometry::TriangleMesh::CreateTorus();
torus->ComputeVertexNormals();
torus->PaintUniformColor({1.0f, 1.0f, 0.0f});
scene->AddGeometry("torus", torus.get(), mat);
scene->ShowAxes(true);
scene->GetCamera()->SetProjection(60.0f, float(width) / float(height), 0.1f,
10.0f, Camera::FovType::Vertical);
scene->GetCamera()->LookAt({0.0f, 0.0f, 0.0f}, {3.0f, 3.0f, 3.0f},
{0.0f, 1.0f, 0.0f});
// This example demonstrates rendering to an image without a window.
// If you want to render to an image from within a window you should use
// scene->GetScene()->RenderToImage() instead.
auto img = app.RenderToImage(*renderer, scene->GetView(), scene->GetScene(),
width, height);
std::cout << "Writing file to " << kOutputFilename << std::endl;
io::WriteImage(kOutputFilename, *img);
// We manually delete these because Filament requires that things get
// destructed in the right order.
delete scene;
delete renderer;
// Cleanup Filament. Normally this is done by app.Run(), but since we are
// not using that we need to do it ourselves.
app.OnTerminate();
}
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