Grass

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import { Engine3D, View3D, Scene3D, CameraUtil, AtmosphericComponent, webGPUContext, HoverCameraController, Object3D, DirectLight, KelvinUtil, LitMaterial, MeshRenderer, Vector3, PostProcessingComponent, BitmapTexture2D, GlobalFog, Color } from '@orillusion/core';
import { GrassComponent, TerrainGeometry } from '@orillusion/effect';
import { Stats } from '@orillusion/stats';
import dat from 'dat.gui';

class Sample_Grass {
    view: View3D;
    post: PostProcessingComponent;

    async run() {
        Engine3D.setting.shadow.autoUpdate = true;
        Engine3D.setting.shadow.updateFrameRate = 1;
        Engine3D.setting.shadow.shadowBound = 500;
        Engine3D.setting.shadow.shadowSize = 1024;

        await Engine3D.init();
        this.view = new View3D();
        this.view.scene = new Scene3D();
        this.view.scene.addComponent(AtmosphericComponent);
        this.view.scene.addComponent(Stats);

        this.view.camera = CameraUtil.createCamera3DObject(this.view.scene);
        this.view.camera.enableCSM = true;
        this.view.camera.perspective(60, webGPUContext.aspect, 1, 5000.0);
        this.view.camera.object3D.addComponent(HoverCameraController).setCamera(35, -20, 500);

        Engine3D.startRenderView(this.view);
        this.createScene(this.view.scene);
    }

    private async createScene(scene: Scene3D) {
        //bitmap
        let bitmapTexture = await Engine3D.res.loadTexture('https://cdn.orillusion.com/terrain/test01/bitmap.png');
        let heightTexture = await Engine3D.res.loadTexture('https://cdn.orillusion.com/terrain/test01/height.png');
        let grassTexture = await Engine3D.res.loadTexture('https://cdn.orillusion.com/terrain/grass/GrassThick.png');
        let gustNoiseTexture = await Engine3D.res.loadTexture('https://cdn.orillusion.com/terrain/grass/displ_noise_curl_1.png');
        let sunObj = new Object3D();
        let sunLight = sunObj.addComponent(DirectLight);
        sunLight.lightColor = KelvinUtil.color_temperature_to_rgb(6553);
        sunLight.castShadow = true;
        sunLight.intensity = 49;
        sunObj.transform.rotationX = 50;
        sunObj.transform.rotationY = 50;
        scene.addChild(sunObj);

        let terrainSize = 1000;
        let size = 1000;
        let grassCount = 6795;
        // let grassCount = 10;
        let des = 1;
        let space = 2;
        let terrainGeometry: TerrainGeometry;
        {
            let mat = new LitMaterial();
            terrainGeometry = new TerrainGeometry(terrainSize, terrainSize);
            terrainGeometry.setHeight(heightTexture as BitmapTexture2D, 100);
            let floor = new Object3D();
            let mr = floor.addComponent(MeshRenderer);
            mr.geometry = terrainGeometry;
            mat.baseMap = bitmapTexture;
            mr.material = mat;
            scene.addChild(floor);
        }

        let grassCom: GrassComponent;
        {
            let grass = new Object3D();
            grassCom = grass.addComponent(GrassComponent);
            grassCom.setGrassTexture(Engine3D.res.whiteTexture);
            // grassCom.setGrassTexture(grassTexture);
            grassCom.setWindNoiseTexture(gustNoiseTexture);
            grassCom.setGrass(18, 1, 5, 1, grassCount);

            let tsw = terrainSize / terrainGeometry.segmentW;
            let tsh = terrainSize / terrainGeometry.segmentH;
            let index = 0;
            terrainGeometry.greenData.forEach((data) => {
                for (let d = 0; d < des; d++) {
                    let node = grassCom.nodes[index++];
                    if (node) {
                        let px = data.x * tsw - terrainSize * 0.5 + Math.random() * space - space * 0.5;
                        let pz = data.z * tsh - terrainSize * 0.5 + Math.random() * space - space * 0.5;
                        let pos = new Vector3(px, 0, pz);

                        let tw = terrainGeometry.segmentW;
                        let th = terrainGeometry.segmentH;
                        let tx = Math.floor(((pos.x + size * 0.5) / size) * terrainGeometry.segmentW);
                        let tz = Math.floor(((pos.z + size * 0.5) / size) * terrainGeometry.segmentH);

                        if (terrainGeometry.heightData.length > tz && terrainGeometry.heightData[tz].length > tx) {
                            pos.y = terrainGeometry.heightData[tz][tx];
                        }

                        let gassSize = 0.8;
                        let scale = (Math.random() * 0.75 + 0.25) * gassSize;
                        node.localPosition = pos;
                        node.localRotation.y = Math.random() * 360;
                        node.localScale = new Vector3(scale, scale, scale);
                        node.updateWorldMatrix(true);
                    }
                }
            });
            scene.addChild(grass);
        }

        // let gui = new dat.GUI()
        // let dir = gui.addFolder('grass-wind')
        // dir.addColor(grassCom.grassMaterial, 'grassBaseColor')
        // dir.addColor(grassCom.grassMaterial, 'grassTopColor')
        // dir.add(grassCom.grassMaterial.windDirection, 'x', -1.0, 1, 0.0001).onChange((v) => {
        //     let tv = grassCom.grassMaterial.windDirection
        //     tv.x = v
        //     grassCom.grassMaterial.windDirection = tv
        // })
        // dir.add(grassCom.grassMaterial.windDirection, 'y', -1.0, 1, 0.0001).onChange((v) => {
        //     let tv = grassCom.grassMaterial.windDirection
        //     tv.y = v
        //     grassCom.grassMaterial.windDirection = tv
        // })
        // dir.add(grassCom.grassMaterial, 'windPower', 0.0, 20, 0.0001)
        // dir.add(grassCom.grassMaterial, 'windSpeed', 0.0, 20, 0.0001)
        // dir.add(grassCom.grassMaterial, 'curvature', 0.0, 1, 0.0001)
        // dir.add(grassCom.grassMaterial, 'grassHeight', 0.0, 100, 0.0001)
        // dir.add(grassCom.grassMaterial, 'roughness', 0.0, 1, 0.0001)
        // dir.add(grassCom.grassMaterial, 'translucent', 0.0, 1, 0.0001)
        // dir.add(grassCom.grassMaterial, 'soft', 0.0, 10, 0.0001)
        // dir.add(grassCom.grassMaterial, 'specular', 0.0, 10, 0.0001)
    }
}

new Sample_Grass().run();