feat: all armor rules... I think?

src/components/ArmorMesh/shaders/fragment.glsl

@@ -0,0 +1,29 @@
+varying vec3 vViewPosition;
+uniform float thickness;
+uniform float penetration;
+uniform float ricochet;
+uniform float caliber;
+uniform float normalization;
+
+void main() {
+  vec3 normalizedNormal = normalize(vNormal);
+  vec3 normalizedViewPosition = normalize(vViewPosition);
+  float cosAngle = dot(normalizedNormal, -normalizedViewPosition);
+  float angle = acos(cosAngle);
+
+  float penetrationChance = 0.0;
+  bool twoCaliberRule = caliber > 2.0 * thickness;
+  bool threeCaliberRule = caliber > 3.0 * thickness;
+  float finalNormalization = twoCaliberRule ? (normalization * 1.4 * caliber) / (2.0 * thickness) : normalization;
+
+  float effectiveArmor = thickness / cos(angle - finalNormalization);
+
+  if(angle < ricochet) {
+    // no auto-ricochet, resume checks
+    if(effectiveArmor <= penetration || threeCaliberRule) {
+      penetrationChance = 1.0;
+    }
+  }
+
+  csm_FragColor *= vec4(1.0, 0.0, 0.0, (1.0 - penetrationChance) * 0.5);
+}