fixed negative distance in voxel traversing

src/shaders/raycasting.cginc

@@ -26,6 +26,8 @@ vec3 solve(vec3 hitPoint, vec3 view, vec3 normal)
 */
 vec4 castBricks(vec3 origin, vec3 start, vec3 dir, vec3 incAxis, uint addr)
 {
+    vec3 o = origin;
+
     // Change scale
     origin = start - origin;
     origin += dir*0.00001;
@@ -49,7 +51,7 @@ vec4 castBricks(vec3 origin, vec3 start, vec3 dir, vec3 incAxis, uint addr)
             // Hit point
             vec3 mini = (pos-origin+0.5 - raySign*0.5) * rayInv;
             float len = max(mini.x, max(mini.y, mini.z));
-            vec3 hitPoint = (origin + dir * len) / 32.0;
+            vec3 hitPoint = (origin + dir * len) / 32.0 + o;
 
             // Normal vector (negate previous increment axis and mult by sign)
             vec3 normal = -incAxis * raySign;
@@ -96,7 +98,7 @@ vec3 castNodes(vec3 origin, vec3 dir)
         {
             // Hit point
             vec3 mini = (pos-origin+0.5 - raySign*0.5) * rayInv;
-            float len = max(mini.x, max(mini.y, mini.z));
+            float len = max(0.0, max(mini.x, max(mini.y, mini.z)));
             vec3 hitPoint = origin + dir * len;
             // Normal vector (negate previous increment axis and mult by sign)
             //vec3 normal = -incAxis * raySign;
@@ -104,7 +106,7 @@ vec3 castNodes(vec3 origin, vec3 dir)
             
             // Cast brick
             vec4 result = castBricks(pos, hitPoint, dir, incAxis, node);
-            if(result.a > 0.0) return result.rgb; //todo: continue if not hit
+            if(result.a > 0.0) return result.rgb;
         }
 
         // Get new closest axis to increment