Add truncated octahedron (python+C) model updated (rst issue and ruff)

Author: sara-mokhtari

sasmodels/models/octahedron_truncated.py

@@ -151,27 +151,26 @@
 name = "octahedron_truncated"
 title = "Truncated Octahedron."
 description = """
+AP = 6./(1.-3(1.-t)*(1.-t)*(1.-t))*(AA+BB+CC);
 
-            AP = 6./(1.-3(1.-t)*(1.-t)*(1.-t))*(AA+BB+CC);
+AA = 1./(2*(qy*qy-qz*qz)*(qy*qy-qx*qx))*((qy-qx)*sin(qy*(1.-t)-qx*t)+(qy+qx)*sin(qy*(1.-t)+qx*t))+
+     1./(2*(qz*qz-qx*qx)*(qz*qz-qy*qy))*((qz-qx)*sin(qz*(1.-t)-qx*t)+(qz+qx)*sin(qz*(1.-t)+qx*t));
 
-            AA = 1./(2*(qy*qy-qz*qz)*(qy*qy-qx*qx))*((qy-qx)*sin(qy*(1.-t)-qx*t)+(qy+qx)*sin(qy*(1.-t)+qx*t))+
-                                1./(2*(qz*qz-qx*qx)*(qz*qz-qy*qy))*((qz-qx)*sin(qz*(1.-t)-qx*t)+(qz+qx)*sin(qz*(1.-t)+qx*t));
+BB = 1./(2*(qz*qz-qx*qx)*(qz*qz-qy*qy))*((qz-qy)*sin(qz*(1.-t)-qy*t)+(qz+qy)*sin(qz*(1.-t)+qy*t))+
+     1./(2*(qx*qx-qy*qy)*(qx*qx-qz*qz))*((qx-qy)*sin(qx*(1.-t)-qy*t)+(qx+qy)*sin(qx*(1.-t)+qy*t));
 
-            BB = 1./(2*(qz*qz-qx*qx)*(qz*qz-qy*qy))*((qz-qy)*sin(qz*(1.-t)-qy*t)+(qz+qy)*sin(qz*(1.-t)+qy*t))+
-                                1./(2*(qx*qx-qy*qy)*(qx*qx-qz*qz))*((qx-qy)*sin(qx*(1.-t)-qy*t)+(qx+qy)*sin(qx*(1.-t)+qy*t));
+CC = 1./(2*(qx*qx-qy*qy)*(qx*qx-qz*qz))*((qx-qz)*sin(qx*(1.-t)-qz*t)+(qx+qz)*sin(qx*(1.-t)+qz*t))+
+     1./(2*(qy*qy-qz*qz)*(qy*qy-qx*qx))*((qy-qz)*sin(qy*(1.-t)-qz*t)+(qy+qz)*sin(qy*(1.-t)+qz*t));
 
-            CC = 1./(2*(qx*qx-qy*qy)*(qx*qx-qz*qz))*((qx-qz)*sin(qx*(1.-t)-qz*t)+(qx+qz)*sin(qx*(1.-t)+qz*t))+
-                                1./(2*(qy*qy-qz*qz)*(qy*qy-qx*qx))*((qy-qz)*sin(qy*(1.-t)-qz*t)+(qy+qz)*sin(qy*(1.-t)+qz*t));
+Normalisation to 1. of AP at q = 0. Division by a Factor 4/3.
 
-normalisation to 1. of AP at q = 0. Division by a Factor 4/3.
 Qx = q * sin_theta * cos_phi;
 Qy = q * sin_theta * sin_phi;
 Qz = q * cos_theta;
 qx = Qx * length_a;
 qy = Qy * length_b;
 qz = Qz * length_c;
 0 < t < 1
-
 """
 category = "shape:parallelepiped"