Fix camera up and skybox AO

Normand Briere

2019-10-06 ce660a4b6ba367bd162dd2cff26d02c80a34c912

 LA.java
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@@ -88,6 +88,9 @@
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     static void vecCopy(cVector a, cVector b)
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     {
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+        Grafreed.Assert (a != null);
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+        assert (b != null);
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+        
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         b.x = a.x;
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         b.y = a.y;
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         b.z = a.z;
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@@ -160,6 +163,7 @@
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     static cVector xformDir(cVector v, double mat[][])
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     {
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+                    new Exception().printStackTrace();
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         System.exit(0);
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         cVector temp = new cVector();
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         xformDir(v, mat, temp);
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@@ -306,14 +310,15 @@
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         }
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-        GrafreeD.Assert(Math.abs(src[0][3]) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(src[1][3]) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(src[2][3]) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(src[3][3] - 1) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(dst[0][3]) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(dst[1][3]) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(dst[2][3]) <= 1E-15);
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-        GrafreeD.Assert(Math.abs(dst[3][3] - 1) <= 1E-15);
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+        // Last row should always be 0 0 0 1
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+        Grafreed.Assert(Math.abs(src[0][3]) <= 1E-15);
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+        Grafreed.Assert(Math.abs(src[1][3]) <= 1E-15);
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+        Grafreed.Assert(Math.abs(src[2][3]) <= 1E-15);
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+        Grafreed.Assert(Math.abs(src[3][3] - 1) <= 1E-15);
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+        Grafreed.Assert(Math.abs(dst[0][3]) <= 1E-15);
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+        Grafreed.Assert(Math.abs(dst[1][3]) <= 1E-15);
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+        Grafreed.Assert(Math.abs(dst[2][3]) <= 1E-15);
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+        Grafreed.Assert(Math.abs(dst[3][3] - 1) <= 1E-15);
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     }
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     static double toRadians(double degrees)
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@@ -623,6 +628,7 @@
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     private static int indxr[] = new int[4];
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     private static int indxc[] = new int[4];
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+    static double[][] Identity = new double[4][4];
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     static int SIZE = 0; // 65536*64;
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@@ -638,6 +644,8 @@
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             costable[i] = Math.cos(PI2 * i/SIZE);
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             sintable[i] = Math.sin(PI2 * i*i/SIZE/SIZE);
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         }
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+        
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+        LA.matIdentity(Identity);
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     }
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     static double cos(double x0)