building destruction particles

addons/voronoishatter/tetrahedron/tetrahedron.gd

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+extends Object
+
+class_name Tetrahedron
+# Use float epsilon consistent with Vector3 precision
+const EPSILON: float = 1e-5
+
+var vertices: Array[Vector3] = []
+var indices: Array[int] = []
+
+func try_calculate_tetrahedron_circumcenter() -> Vector3:
+    if vertices == null or len(vertices) != 4:
+        VoronoiLog.err("try_calculate_tetrahedron_circumcenter: Invalid vertices in input.")
+        return Vector3.INF
+
+    var a: Vector3 = vertices[0]
+    var b: Vector3 = vertices[1]
+    var c: Vector3 = vertices[2]
+    var d: Vector3 = vertices[3]
+
+    # Use coordinates relative to point 'a'. Use float consistently.
+    var ba: Vector3 = b - a
+    var ca: Vector3 = c - a
+    var da: Vector3 = d - a
+
+    # Use length_squared()
+    var len_ba_sq: float = ba.length_squared()
+    var len_ca_sq: float = ca.length_squared()
+    var len_da_sq: float = da.length_squared()
+
+    # cross products
+    var cross_cd: Vector3 = ca.cross(da)
+    var cross_db: Vector3 = da.cross(ba)
+    var cross_bc: Vector3 = ba.cross(ca)
+
+    # Scalar triple product (volume related) is float
+    var scalar_triple_product: float = ba.dot(cross_cd)
+
+    # Check for degenerate or near-degenerate tetrahedron
+    if abs(scalar_triple_product) < EPSILON:
+        return Vector3.INF # Return inf for degenerate cases
+
+    # Denominator calculation using float
+    var denominator_inv = 0.5 / scalar_triple_product
+
+    # Calculate offset using float operations
+    var circ_relative: Vector3 = (cross_cd * len_ba_sq + cross_db * len_ca_sq + cross_bc * len_da_sq) * denominator_inv
+
+    # Absolute circumcenter
+    var circumcenter: Vector3 = a + circ_relative
+
+    return circumcenter