wehub-resource-sync
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
// Showcase how to incrementally log data belonging to the same archetype, and re-use some or all
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// of it across frames.
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#include <rerun.hpp>
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#include <algorithm>
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#include <random>
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static const char* README = R"(
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# Incremental Logging
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This example showcases how to incrementally log data belonging to the same archetype, and re-use some or all of it across frames.
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It was logged with the following code:
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```cpp
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std::vector<rerun::Color> colors(10, rerun::Color(255, 0, 0));
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std::vector<rerun::Radius> radii(10, rerun::Radius(0.1f));
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// Only log colors and radii once.
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rec.set_time_sequence("frame_nr", 0);
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rec.log("points", colors, radii);
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std::default_random_engine gen;
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std::uniform_real_distribution<float> dist_pos(-5.0f, 5.0f);
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// Then log only the points themselves each frame.
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//
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// They will automatically re-use the colors and radii logged at the beginning.
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for (int i = 0; i < 10; ++i) {
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rec.set_time_sequence("frame_nr", i);
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std::vector<rerun::Position3D> points(10);
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std::generate(points.begin(), points.end(), [&] {
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return rerun::Position3D(dist_pos(gen), dist_pos(gen), dist_pos(gen));
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});
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rec.log("points", rerun::Points3D(points));
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}
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```
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Move the time cursor around, and notice how the colors and radii from frame 0 are still picked up by later frames, while the points themselves keep changing every frame.
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)";
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int main() {
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const auto rec = rerun::RecordingStream("rerun_example_incremental_logging");
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rec.spawn().exit_on_failure();
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rec.log_static(
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"readme",
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rerun::TextDocument(README).with_media_type(rerun::components::MediaType::markdown())
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);
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// Only log colors and radii once.
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// Logging statically with `RecordingStream::log_static` would also work.
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rec.set_time_sequence("frame_nr", 0);
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rec.log("points", rerun::Points3D().with_colors(rerun::Color(255, 0, 0)).with_radii(0.1f));
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std::default_random_engine gen;
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std::uniform_real_distribution<float> dist_pos(-5.0f, 5.0f);
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// Then log only the points themselves each frame.
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//
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// They will automatically re-use the colors and radii logged at the beginning.
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for (int i = 0; i < 10; ++i) {
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rec.set_time_sequence("frame_nr", i);
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std::vector<rerun::Position3D> points(10);
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std::generate(points.begin(), points.end(), [&] {
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return rerun::Position3D(dist_pos(gen), dist_pos(gen), dist_pos(gen));
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});
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rec.log("points", rerun::Points3D::update_fields().with_positions(points));
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}
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}
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