nordisk/facett

facett-model3d/examples/view_glb.rs

//! A minimal "open any glTF" viewer — the facett-model3d analogue of
//! gltf-viewer-rs, within facett's CPU-painter limits (Lambert + base colour, no
//! PBR/textures/animation).
//!
//! `cargo run -p facett-model3d --example view_glb -- /path/to/model.glb`
//!
//! With no path it falls back to the bundled skull. Drag to rotate (pauses the
//! auto-spin); the status slider tints the `eyes` group if the model has one.

use eframe::egui;
use facett_core::Facet;
use facett_model3d::Model3D;

struct App {
    model: Model3D,
    source: String,
}

impl eframe::App for App {
    fn ui(&mut self, root: &mut egui::Ui, _frame: &mut eframe::Frame) {
        egui::Panel::top("hdr").show(root, |ui| {
            let s = self.model.state_json();
            ui.label(format!(
                "{}  ·  {} triangles  ·  groups: {:?}",
                self.source,
                s["triangles"].as_u64().unwrap_or(0),
                self.model.mesh().group_names(),
            ));
        });
        egui::CentralPanel::default().show(root, |ui| {
            self.model.ui(ui);
        });
    }
}

fn main() -> eframe::Result {
    let arg = std::env::args().nth(1);
    let (model, source) = match arg {
        Some(path) => {
            let bytes = std::fs::read(&path).unwrap_or_else(|e| panic!("read {path}: {e}"));
            let m = Model3D::from_glb(&path, &bytes).unwrap_or_else(|e| panic!("load {path}: {e}"));
            (m, path)
        }
        None => (Model3D::skull("skull3d"), "<bundled skull>".to_string()),
    };
    let app = App { model: model.with_status_control(true), source };
    eprintln!("view_glb: loaded {} ({} tris, groups {:?})", app.source, app.model.mesh().triangle_count(), app.model.mesh().group_names());
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default().with_inner_size(egui::Vec2::new(820.0, 700.0)),
        ..Default::default()
    };
    eframe::run_native("facett-model3d · view_glb", options, Box::new(|_cc| Ok(Box::new(app))))
}