Interactive ripples effect (#194)

examples/interactive-ripples/main.js

@@ -0,0 +1,156 @@
+import {
+  SparkControls,
+  SparkRenderer,
+  SplatMesh,
+  dyno,
+} from "@sparkjsdev/spark";
+import * as THREE from "three";
+import { getAssetFileURL } from "/examples/js/get-asset-url.js";
+
+const canvas = document.getElementById("canvas");
+const renderer = new THREE.WebGLRenderer({ canvas, antialias: true });
+renderer.setPixelRatio(window.devicePixelRatio);
+renderer.setSize(canvas.clientWidth, canvas.clientHeight, false);
+renderer.setClearColor(0x000000, 1);
+
+const scene = new THREE.Scene();
+const spark = new SparkRenderer({ renderer });
+scene.add(spark);
+
+const camera = new THREE.PerspectiveCamera(
+  50,
+  canvas.clientWidth / canvas.clientHeight,
+  0.01,
+  2000,
+);
+camera.position.set(0, 0, 3);
+camera.lookAt(0, 0, 0);
+scene.add(camera);
+
+function handleResize() {
+  const w = canvas.clientWidth;
+  const h = canvas.clientHeight;
+  renderer.setSize(w, h, false);
+  camera.aspect = w / h;
+  camera.updateProjectionMatrix();
+}
+window.addEventListener("resize", handleResize);
+
+// Camera controls with mouse and WASD enabled
+const controls = new SparkControls({ canvas: renderer.domElement });
+controls.fpsMovement.enable = true; // Enable WASD movement
+controls.pointerControls.enable = true; // Enable mouse controls
+
+// Dyno shader with time and shockwave function
+function passthroughDyno(timeUniform, hitpointUniform) {
+  return dyno.dynoBlock(
+    { gsplat: dyno.Gsplat },
+    { gsplat: dyno.Gsplat },
+    ({ gsplat }) => {
+      const shader = new dyno.Dyno({
+        inTypes: {
+          gsplat: dyno.Gsplat,
+          time: "float",
+          hitpoint: "vec3",
+        },
+        outTypes: { gsplat: dyno.Gsplat },
+        globals: () => [
+          dyno.unindent(`
+           vec3 shockwave(vec3 center, float t, vec3 hitpoint) {
+             vec3 direction = center - hitpoint;
+             float distance = length(direction);
+             center += normalize(direction)*sin(t*4.-distance*5.)*exp(-t)*smoothstep(t*2.,0.,distance)*.5;
+             return center;
+           }
+           vec4 shockwaveColor(vec4 rgba, vec3 center, float t, vec3 hitpoint) {
+             vec3 direction = center - hitpoint;
+             float distance = length(direction);
+             float wave = sin(t*4.-distance*5.)*exp(-t*.7)*smoothstep(t*2.,0.,distance);
+             float brightness = pow(abs(wave),3.) * 10.; // Increase brightness on wave crests
+             rgba.rgb += brightness;
+             return rgba;
+           }
+        `),
+        ],
+        statements: ({ inputs, outputs }) =>
+          dyno.unindentLines(`
+          ${outputs.gsplat} = ${inputs.gsplat};
+          // Apply shockwave function to position
+          ${outputs.gsplat}.center = shockwave(${inputs.gsplat}.center, ${inputs.time}, ${inputs.hitpoint});
+          // Apply shockwave function to color
+          ${outputs.gsplat}.rgba = shockwaveColor(${inputs.gsplat}.rgba, ${inputs.gsplat}.center, ${inputs.time}, ${inputs.hitpoint});
+        `),
+      });
+      return {
+        gsplat: shader.apply({
+          gsplat,
+          time: timeUniform,
+          hitpoint: hitpointUniform,
+        }).gsplat,
+      };
+    },
+  );
+}
+
+async function run() {
+  // Time and hitpoint uniforms for dyno shader
+  const timeUniform = dyno.dynoFloat(0.0);
+  const hitpointUniform = dyno.dynoVec3(new THREE.Vector3(0, 0, 1000)); // Initialize far away to avoid initial effect
+
+  // Load valley.spz
+  const splatURL = await getAssetFileURL("valley.spz");
+  const valley = new SplatMesh({ url: splatURL });
+  await valley.initialized;
+
+  // Fix orientation - rotate 180 degrees around X axis
+  valley.rotateX(Math.PI);
+
+  // Apply dyno shader with time and hitpoint uniforms
+  valley.objectModifier = passthroughDyno(timeUniform, hitpointUniform);
+  valley.updateGenerator();
+
+  scene.add(valley);
+
+  // Raycaster for click detection
+  const raycaster = new THREE.Raycaster();
+  raycaster.params.Points = { threshold: 1.0 }; // Increased threshold for better hit detection
+
+  // Simple time counter that resets on click
+  let timeCounter = 0;
+
+  // Click event listener to set hitpoint and reset time
+  renderer.domElement.addEventListener("pointerdown", (event) => {
+    const rect = renderer.domElement.getBoundingClientRect();
+    const ndc = new THREE.Vector2(
+      ((event.clientX - rect.left) / rect.width) * 2 - 1,
+      -((event.clientY - rect.top) / rect.height) * 2 + 1,
+    );
+    raycaster.setFromCamera(ndc, camera);
+    const hits = raycaster.intersectObject(valley, false);
+    const hit = hits?.length ? hits[0] : null;
+
+    if (!hit) {
+      return;
+    }
+
+    const localPoint = valley.worldToLocal(hit.point.clone());
+    // Don't invert Y or Z - keep original coordinates
+
+    hitpointUniform.value.copy(localPoint);
+    timeCounter = 0; // Reset time counter
+  });
+
+  renderer.setAnimationLoop((timeMs) => {
+    // Increment time counter each frame
+    timeCounter += 0.016; // ~60fps increment
+    timeUniform.value = timeCounter;
+
+    // Update dyno uniforms to propagate to the mesh each frame
+    valley.updateVersion();
+
+    controls.update(camera);
+    renderer.render(scene, camera);
+  });
+}
+
+run();