From 81a10f04c37a09c37a4139087edc5608252d44db Mon Sep 17 00:00:00 2001
From: Srinidhi-4419 <kulkarnisrinidhi85@gmail.com>
Date: Fri, 2 Oct 2026 13:19:09 +0530
Subject: [PATCH 1/4] fix: preserve vertex attributes with smooth normals

---
 src/webgl/p5.Geometry.js       | 77 +++++++++++++++++-----------------
 test/unit/webgl/p5.Geometry.js | 34 +++++++++++++++
 2 files changed, 73 insertions(+), 38 deletions(-)

diff --git a/src/webgl/p5.Geometry.js b/src/webgl/p5.Geometry.js
index 5f7dfeff78..10a23bb813 100644
--- a/src/webgl/p5.Geometry.js
+++ b/src/webgl/p5.Geometry.js
@@ -1193,74 +1193,75 @@ class Geometry {
    */
   computeNormals(shadingType = constants.FLAT, { roundToPrecision = 3 } = {}) {
     const vertexNormals = this.vertexNormals;
-    let vertices = this.vertices;
+    const vertices = this.vertices;
     const faces = this.faces;
     let iv;
 
     if (shadingType === constants.SMOOTH) {
       const vertexIndices = {};
       const uniqueVertices = [];
+      const originalToUnique = [];
 
       const power = Math.pow(10, roundToPrecision);
       const rounded = val => Math.round(val * power) / power;
       const getKey = vert =>
         `${rounded(vert.x)},${rounded(vert.y)},${rounded(vert.z)}`;
 
-      // loop through each vertex and add uniqueVertices
       for (let i = 0; i < vertices.length; i++) {
         const vertex = vertices[i];
         const key = getKey(vertex);
+
         if (vertexIndices[key] === undefined) {
           vertexIndices[key] = uniqueVertices.length;
           uniqueVertices.push(vertex);
         }
+
+        originalToUnique[i] = vertexIndices[key];
       }
 
-      // update face indices to use the deduplicated vertex indices
-      faces.forEach(face => {
-        for (let fv = 0; fv < 3; ++fv) {
-          const originalVertexIndex = face[fv];
-          const originalVertex = vertices[originalVertexIndex];
-          const key = getKey(originalVertex);
-          face[fv] = vertexIndices[key];
-        }
-      });
+      const smoothNormals = [];
 
-      // update edge indices to use the deduplicated vertex indices
-      this.edges.forEach(edge => {
-        for (let ev = 0; ev < 2; ++ev) {
-          const originalVertexIndex = edge[ev];
-          const originalVertex = vertices[originalVertexIndex];
-          const key = getKey(originalVertex);
-          edge[ev] = vertexIndices[key];
+      for (iv = 0; iv < uniqueVertices.length; ++iv) {
+        smoothNormals.push(new Vector(0, 0, 0));
+      }
+
+      faces.forEach((face, f) => {
+        const faceNormal = this._getFaceNormal(f);
+
+        for (let fv = 0; fv < 3; ++fv) {
+          const vertexIndex = originalToUnique[face[fv]];
+          smoothNormals[vertexIndex].add(faceNormal);
         }
       });
 
-      // update the deduplicated vertices
-      this.vertices = vertices = uniqueVertices;
-    }
+      for (iv = 0; iv < smoothNormals.length; ++iv) {
+        smoothNormals[iv].normalize();
+      }
 
-    // initialize the vertexNormals array with empty vectors
-    vertexNormals.length = 0;
-    for (iv = 0; iv < vertices.length; ++iv) {
-      vertexNormals.push(new Vector(0, 0, 0));
-    }
+      vertexNormals.length = 0;
 
-    // loop through all the faces adding its normal to the normal
-    // of each of its vertices
-    faces.forEach((face, f) => {
-      const faceNormal = this._getFaceNormal(f);
+      for (iv = 0; iv < vertices.length; ++iv) {
+        vertexNormals.push(smoothNormals[originalToUnique[iv]].copy());
+      }
+    } else {
+      vertexNormals.length = 0;
 
-      // all three vertices get the normal added
-      for (let fv = 0; fv < 3; ++fv) {
-        const vertexIndex = face[fv];
-        vertexNormals[vertexIndex].add(faceNormal);
+      for (iv = 0; iv < vertices.length; ++iv) {
+        vertexNormals.push(new Vector(0, 0, 0));
       }
-    });
 
-    // normalize the normals
-    for (iv = 0; iv < vertices.length; ++iv) {
-      vertexNormals[iv].normalize();
+      faces.forEach((face, f) => {
+        const faceNormal = this._getFaceNormal(f);
+
+        for (let fv = 0; fv < 3; ++fv) {
+          const vertexIndex = face[fv];
+          vertexNormals[vertexIndex].add(faceNormal);
+        }
+      });
+
+      for (iv = 0; iv < vertices.length; ++iv) {
+        vertexNormals[iv].normalize();
+      }
     }
 
     return this;
diff --git a/test/unit/webgl/p5.Geometry.js b/test/unit/webgl/p5.Geometry.js
index 035237b091..2531bfca66 100644
--- a/test/unit/webgl/p5.Geometry.js
+++ b/test/unit/webgl/p5.Geometry.js
@@ -15,6 +15,40 @@ suite('p5.Geometry', function () {
     myp5.remove();
   });
 
+  suite('computeNormals', function () {
+    test('SMOOTH preserves vertices with different UVs', function () {
+      const geom = new p5.Geometry();
+
+      geom.vertices.push(
+        myp5.createVector(0, 0, 0),
+        myp5.createVector(1, 0, 0),
+        myp5.createVector(0, 1, 0),
+        myp5.createVector(0, 0, 0)
+      );
+
+      geom.uvs.push(
+        0, 0,
+        1, 0,
+        0, 1,
+        1, 1
+      );
+
+      geom.faces.push(
+        [0, 1, 2],
+        [3, 2, 1]
+      );
+
+      const originalVertexCount = geom.vertices.length;
+      const originalUvs = [...geom.uvs];
+
+      geom.computeNormals(myp5.SMOOTH);
+
+      expect(geom.vertices.length).toEqual(originalVertexCount);
+      expect(geom.uvs).toEqual(originalUvs);
+      expect(geom.vertexNormals[0]).toEqual(geom.vertexNormals[3]);
+    });
+  });
+
   suite('computeTangents', function () {
     test('a uv-mapped triangle gets a +u tangent with correct handedness',
       function () {

From 0c30b9960cc005aa906169cc929d03e889238efc Mon Sep 17 00:00:00 2001
From: Srinidhi-4419 <kulkarnisrinidhi85@gmail.com>
Date: Sun, 4 Oct 2026 21:06:58 +0530
Subject: [PATCH 2/4] test: add visual test for smooth normals

---
 test/unit/visual/cases/webgl.js | 65 +++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/test/unit/visual/cases/webgl.js b/test/unit/visual/cases/webgl.js
index e2e40d2843..5cd37797a0 100644
--- a/test/unit/visual/cases/webgl.js
+++ b/test/unit/visual/cases/webgl.js
@@ -1100,6 +1100,71 @@ visualSuite('WebGL', function () {
         screenshot();
       }
     );
+    visualTest(
+      'computeNormals(SMOOTH) preserves smooth normals',
+      function (p5, screenshot) {
+        p5.createCanvas(100, 100, p5.WEBGL);
+
+        const geom = p5.buildGeometry(() => {
+          const verticesPerRing = 20;
+          const rings = 20;
+
+          for (let ring = 0; ring < rings - 1; ring++) {
+            p5.beginShape(p5.QUAD_STRIP);
+
+            for (let i = 0; i <= verticesPerRing; i++) {
+              for (const ringOffset of [0, 1]) {
+                const y = p5.map(
+                  ring + ringOffset,
+                  0,
+                  rings,
+                  40,
+                  -40
+                );
+                const angle = p5.map(
+                  i,
+                  0,
+                  verticesPerRing,
+                  0,
+                  p5.TWO_PI
+                );
+
+                const position = p5.createVector(40, 0).rotate(angle);
+
+                const radius = p5.noise(
+                  200 + position.x * 0.01,
+                  200 + y * 0.01,
+                  200 + position.y * 0.01
+                );
+
+                const squishedPosition = p5.createVector(
+                  position.x * radius,
+                  y,
+                  position.y * radius
+                );
+
+                p5.vertex(
+                  squishedPosition.x,
+                  squishedPosition.y,
+                  squishedPosition.z
+                );
+              }
+            }
+
+            p5.endShape();
+          }
+        });
+
+        geom.computeNormals(p5.SMOOTH);
+
+        p5.background(255);
+        p5.normalMaterial();
+        p5.rotateY(0.5);
+        p5.model(geom);
+
+        screenshot();
+      }
+    );
   });
 
   visualSuite('font data', () => {

From 9d5ed8b576cea868f648d1143e16c6b06975fe65 Mon Sep 17 00:00:00 2001
From: Srinidhi-4419 <kulkarnisrinidhi85@gmail.com>
Date: Tue, 6 Oct 2026 20:30:30 +0530
Subject: [PATCH 3/4] test: add visual test screenshot for smooth normals

---
 .../000.png                                      | Bin 0 -> 5260 bytes
 .../metadata.json                                |   3 +++
 2 files changed, 3 insertions(+)
 create mode 100644 test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/000.png
 create mode 100644 test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/metadata.json

diff --git a/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/000.png b/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/000.png
new file mode 100644
index 0000000000000000000000000000000000000000..90364077c8199e751aed2c8cbd470f9d02381d17
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diff --git a/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/metadata.json b/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/metadata.json
new file mode 100644
index 0000000000..2d4bfe30da
--- /dev/null
+++ b/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/metadata.json	
@@ -0,0 +1,3 @@
+{
+  "numScreenshots": 1
+}
\ No newline at end of file

From 071aeca6263c5b90e3ab1c9982a06abce91a7d8f Mon Sep 17 00:00:00 2001
From: Srinidhi-4419 <kulkarnisrinidhi85@gmail.com>
Date: Wed, 7 Oct 2026 20:19:52 +0530
Subject: [PATCH 4/4] test: make smooth normals visual test deterministic

---
 test/unit/visual/cases/webgl.js               |   2 +-
 .../000.png                                   | Bin 5260 -> 6445 bytes
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/unit/visual/cases/webgl.js b/test/unit/visual/cases/webgl.js
index 5cd37797a0..757e597e47 100644
--- a/test/unit/visual/cases/webgl.js
+++ b/test/unit/visual/cases/webgl.js
@@ -1104,7 +1104,7 @@ visualSuite('WebGL', function () {
       'computeNormals(SMOOTH) preserves smooth normals',
       function (p5, screenshot) {
         p5.createCanvas(100, 100, p5.WEBGL);
-
+        p5.noiseSeed(0);
         const geom = p5.buildGeometry(() => {
           const verticesPerRing = 20;
           const rings = 20;
diff --git a/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/000.png b/test/unit/visual/screenshots/WebGL/buildGeometry()/computeNormals(SMOOTH) preserves smooth normals/000.png
index 90364077c8199e751aed2c8cbd470f9d02381d17..a9df86a1e728eb20c333b936e5acf0a07cc4f037 100644
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