feat: armor gradient

src/components/ArmorMesh/shaders/fragment.glsl

@@ -15,13 +15,27 @@ void main() {
   bool twoCaliberRule = caliber > 2.0 * thickness;
   bool threeCaliberRule = caliber > 3.0 * thickness;
   float finalNormalization = twoCaliberRule ? (normalization * 1.4 * caliber) / (2.0 * thickness) : normalization;
-
+  float finalPenetration = penetration;
   float effectiveArmor = thickness / cos(angle - finalNormalization);
 
   if(angle < ricochet) {
     // no auto-ricochet, resume checks
-    if(effectiveArmor <= penetration || threeCaliberRule) {
+    if(threeCaliberRule) {
       penetrationChance = 1.0;
+    } else {
+      float maxRandomPenetrationBuff = finalPenetration * 0.05;
+      float penetrationDifference = effectiveArmor - finalPenetration;
+
+      if(penetrationDifference > maxRandomPenetrationBuff) {
+        // even with a +5% buff, can't penetrate
+        penetrationChance = 0.0;
+      } else if(penetrationDifference < -maxRandomPenetrationBuff) {
+        // event with a -5% nerf, can penetrate
+        penetrationChance = 1.0;
+      } else {
+        // penetration gradiant
+        penetrationChance = 1.0 - (penetrationDifference + maxRandomPenetrationBuff) / (2.0 * maxRandomPenetrationBuff);
+      }
     }
   }