From 426dd88d29c953f0fc8a6c632f254017f1f8da7b Mon Sep 17 00:00:00 2001
From: unknown <>
Date: Thu, 20 Jul 2023 10:46:01 -0400
Subject: [PATCH] Fix degenerate normals

---
 src/main/java/electrosphere/FluidSim.java    |    2 +-
 src/main/java/electrosphere/Main.java        |    2 +-
 src/main/java/electrosphere/render/Mesh.java | 1095 +++++++++++++++++-
 3 files changed, 1095 insertions(+), 4 deletions(-)

diff --git a/src/main/java/electrosphere/FluidSim.java b/src/main/java/electrosphere/FluidSim.java
index e5feb9a..c5a1b1c 100644
--- a/src/main/java/electrosphere/FluidSim.java
+++ b/src/main/java/electrosphere/FluidSim.java
@@ -79,7 +79,7 @@ public class FluidSim {
                 for(int k = 0; k < DIM; k++){
                     if(
                         Math.abs(16 - i) < 4 &&
-                        Math.abs(8 - j) < 4 &&
+                        Math.abs(j) < 4 &&
                         Math.abs(10 - k) < 4
                     ){
                         xf.put(1);
diff --git a/src/main/java/electrosphere/Main.java b/src/main/java/electrosphere/Main.java
index b269164..150ab15 100644
--- a/src/main/java/electrosphere/Main.java
+++ b/src/main/java/electrosphere/Main.java
@@ -32,7 +32,7 @@ public class Main {
                 lastTime = System.currentTimeMillis();
                 sim.simulate(i,0.001f);
                 time = time + (System.currentTimeMillis() - lastTime);
-                Mesh.remesh(sim);
+                Mesh.remesh(sim,i);
                 GLFWContext.redraw();
                 i++;
                 if(i == 1000){
diff --git a/src/main/java/electrosphere/render/Mesh.java b/src/main/java/electrosphere/render/Mesh.java
index bda1c20..fe0ec27 100644
--- a/src/main/java/electrosphere/render/Mesh.java
+++ b/src/main/java/electrosphere/render/Mesh.java
@@ -198,10 +198,1031 @@ public class Mesh {
         GL45.glUniformMatrix4fv(GL45.glGetUniformLocation(shaderProgram, "model"), false, model.get(new float[16]));
     }
 
-    public static void remesh(FluidSim sim){
+    static final double[] badFloats = new double[]{
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+0.468777,
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+-0.005341,
+-0.003678,
+-0.005737,
+-0.013142,
+-0.028877,
+-0.307512
+    };
+
+    public static void remesh(FluidSim sim, long frame){
         //generate verts
         TerrainChunkData data = generateTerrainChunkData(sim.getData());
 
+        // for(int i = 0; i < data.normals.size(); i+=3){
+        //     // if(i > 100 && data.normals.get(i+1) < 0.7){
+        //         data.normals.set(i+1, 1f);
+        //         data.normals.set(i+2, 0f);
+        //         System.out.printf("%.2f %.2f %.2f,\n",data.normals.get(i+0),data.normals.get(i+1),data.normals.get(i+2));
+        //     // }
+        // }
+
 
         //
         //Buffer data to GPU
@@ -612,6 +1633,37 @@ public class Mesh {
         (byte)0x13
     };
 
+    //allows reverse lookup where vertList index returns the points that vert is concerned with
+    static final int[][] vertIndexInverseTable = new int[][]{
+        {0,1},
+        {1,2},
+        {2,3},
+        {3,0},
+        {4,5},
+        {5,6},
+        {6,7},
+        {7,4},
+        {0,4},
+        {1,5},
+        {2,6},
+        {3,7},
+    };
+
+    //Lookup for the direction vectors for every vertex pair
+    static final Vector3f[] indexVectorLookupTable = new Vector3f[]{
+        new Vector3f(0,0,1),
+        new Vector3f(1,0,0),
+        new Vector3f(0,0,-1),
+        new Vector3f(-1,0,0),
+        new Vector3f(0,0,1),
+        new Vector3f(1,0,0),
+        new Vector3f(0,0,-1),
+        new Vector3f(-1,0,0),
+        new Vector3f(0,1,0),
+        new Vector3f(0,1,0),
+        new Vector3f(0,1,0),
+        new Vector3f(0,1,0),
+    };
 
 
     protected static int polygonize(
@@ -721,6 +1773,36 @@ public class Mesh {
             Vector3f v = verts.get(index2).sub(verts.get(index1), new Vector3f());
             Vector3f n = new Vector3f(u.y * v.z - u.z * v.y, u.z * v.x - u.x * v.z, u.x * v.y - u.y * v.x).normalize();
 
+            // Vector3f alignmentVector = new Vector3f();
+
+            // for(int j = 0; j < 3; j++){
+            //     int[] points = vertIndexInverseTable[triTable[cubeIndex][i+j]];
+            //     float factor = 1.0f / Math.abs(points[1] - points[0]);
+            //     //if point two is greater than point one, flip vector
+            //     if(points[0] < points[1]){
+            //         alignmentVector.add(
+            //             -indexVectorLookupTable[triTable[cubeIndex][i+j]].x * factor,
+            //             -indexVectorLookupTable[triTable[cubeIndex][i+j]].y * factor,
+            //             -indexVectorLookupTable[triTable[cubeIndex][i+j]].z * factor
+            //         );
+            //     } else {
+            //         alignmentVector.add(
+            //             indexVectorLookupTable[triTable[cubeIndex][i+j]].z * factor,
+            //             indexVectorLookupTable[triTable[cubeIndex][i+j]].y * factor,
+            //             indexVectorLookupTable[triTable[cubeIndex][i+j]].z * factor
+            //         );
+            //     }
+            // }
+            // n.x = 0;
+            // n.y = 1;
+            // // n.z = 0;
+            // n.normalize();
+            // // n.set(alignmentVector.normalize().mul(-1));
+            // // if(n.dot(alignmentVector.normalize()) >= 0){
+            // //     n.add(alignmentVector.normalize()).div(2.0f);
+            // // }
+
+
 
 
             //for each vertex, average the new normal with the normals that are already there
@@ -889,7 +1971,16 @@ public class Mesh {
 
     private static Vector3f averageNormals(Vector3f normal0, float proportion0, Vector3f normal1, float proportion1){
         Vector3f rVal = new Vector3f(normal0);
-        rVal = rVal.mul(proportion0).add(new Vector3f(normal1).mul(proportion1));
+        rVal = rVal.mul(proportion0).add(new Vector3f(normal1).mul(proportion1)).normalize();
+        if(Float.isNaN(rVal.x)){
+            rVal.x = 0;
+        }
+        if(Float.isNaN(rVal.y)){
+            rVal.y = 0;
+        }
+        if(Float.isNaN(rVal.z)){
+            rVal.z = 0;
+        }
         return rVal;
     }