move corners to inside of the face, rather than end-caps.

corners.c

@@ -1,6 +1,8 @@
 /** \file
  * Generate an OpenSCAD with connectors for each face.
  *
+ * Options are inside only (with face flush on outside)
+ * or with a slot for the face (like a corner cap)
  */
 #include <stdio.h>
 #include <stdlib.h>
@@ -14,18 +16,44 @@
 #include "stl_3d.h"
 
 
+static v3_t avg_x, avg_y, avg_z;
+
+static void
+print_multmatrix(
+	const refframe_t * const ref,
+	const int transpose
+)
+{
+	printf("multmatrix(m=["
+		"[%f,%f,%f,0],"
+		"[%f,%f,%f,0],"
+		"[%f,%f,%f,0],"
+		"[ 0, 0, 0,1]])\n",
+		transpose ? ref->x.p[0] : ref->x.p[0],
+		transpose ? ref->x.p[1] : ref->y.p[0],
+		transpose ? ref->x.p[2] : ref->z.p[0],
+		transpose ? ref->y.p[0] : ref->x.p[1],
+		transpose ? ref->y.p[1] : ref->y.p[1],
+		transpose ? ref->y.p[2] : ref->z.p[1],
+		transpose ? ref->z.p[0] : ref->x.p[2],
+		transpose ? ref->z.p[1] : ref->y.p[2],
+		transpose ? ref->z.p[2] : ref->z.p[2]
+	);
+}
+
 static void
 make_faces(
 	const stl_3d_t * const stl,
 	const stl_vertex_t * const v,
 	const double thickness,
+	const double translate,
 	const double inset_dist,
 	const double hole_dist,
-	const double hole_rad
+	const double hole_rad,
+	const double hole_height
 )
 {
 	int * const face_used = calloc(sizeof(*face_used), stl->num_face);
-	const double hole_height = 40;
 
 	// generate all of the coplanar polygons at this vertex
 	const stl_vertex_t ** const vertex_list = calloc(sizeof(**vertex_list), stl->num_vertex);
@@ -53,24 +81,21 @@ make_faces(
 			f->vertex[(start_vertex+2) % 3]->p
 		);
 
+		avg_x = v3_add(avg_x, ref.x);
+		avg_y = v3_add(avg_y, ref.y);
+		avg_z = v3_add(avg_z, ref.z);
+
 		// use the transpose of the rotation matrix,
 		// which will rotate from (x,y) to the correct
 		// orientation relative to this connector node.
-		printf("multmatrix(m=[[%f,%f,%f,0],[%f,%f,%f,0],[%f,%f,%f,0],[0,0,0,1]]) {\n",
+		print_multmatrix(&ref, 0);
-			ref.x.p[0],
+		printf("{\n");
-			ref.y.p[0],
-			ref.z.p[0],
-			ref.x.p[1],
-			ref.y.p[1],
-			ref.z.p[1],
-			ref.x.p[2],
-			ref.y.p[2],
-			ref.z.p[2]
-		);
 
 		// generate the polygon plane
+		if (thickness != 0)
+		{
 		printf("translate([0,0,%f]) linear_extrude(height=%f) polygon(points=[\n",
-			-thickness/2,
+			translate,
 			thickness
 		);
 
@@ -85,9 +110,10 @@ make_faces(
 			printf("[%f,%f],", x, y);
 		}
 		printf("\n]);\n");
+		}
 
-		// generate the mounting holes
+		// generate the mounting holes/pins
-		if (hole_rad)
+		if (hole_rad != 0)
 		{
 		for(int k=0 ; k < vertex_count ; k++)
 		{
@@ -97,7 +123,7 @@ make_faces(
 				vertex_list[(k+1) % vertex_count]->p,
 				vertex_list[(k+2) % vertex_count]->p
 			);
-			printf("translate([%f,%f,0]) cylinder(r=%f,h=%f, center=true, $fs=1);\n",
+			printf("translate([%f,%f,0]) cylinder(r=%f,h=%f, $fs=1);\n",
 				x, y,
 				hole_rad,
 				hole_height
@@ -121,39 +147,56 @@ main(void)
 		return EXIT_FAILURE;
 	const double thickness = 3;
 	const double inset_dist = 2;
-	const double hole_dist = 7;
+	const double hole_dist = 5;
 	const double hole_rad = 3.3/2;
-	const double hole_height = 40;
 
 	// for each vertex, find the coplanar triangles
 	// \todo: do coplanar bits
 
-	for(int i = 18 ; i < stl->num_vertex ; i++)
+	for(int i = 0 ; i < stl->num_vertex ; i++)
 	{
 		const stl_vertex_t * const v = &stl->vertex[i];
 		const v3_t origin = v->p;
 
 		printf("// vertex %d\n"
 			"//translate([%f,%f,%f])\n"
-			"render() difference()\n"
 			"{\n"
-			"//sphere(r=%f);\n",
+			"render() difference()\n"
-			i, origin.p[0], origin.p[1], origin.p[2], thickness/2);
+			"{\n",
+			i, origin.p[0], origin.p[1], origin.p[2]);
+		avg_x.p[0] = avg_x.p[1] = avg_x.p[2] = 0;
+		avg_y.p[0] = avg_y.p[1] = avg_y.p[2] = 0;
+		avg_z.p[0] = avg_z.p[1] = avg_z.p[2] = 0;
 		
-		printf("render() intersection() {\n");
+		//printf("render() intersection() {\n");
-		printf("sphere(r=20);\nunion() {\n");
+		printf("union() {\n");
-		make_faces(stl, v, 2*thickness, -thickness/2, 0, 0);
+		make_faces(stl, v, thickness, -thickness, 0, 0, 0, 0);
-		printf("}\n");
-		printf("}\n");
-
-		make_faces(stl, v, thickness, inset_dist, hole_dist, hole_rad);
-
 
 		printf("}\n");
+		//printf("}\n");
+
+		printf("union() {\n");
+		// slice away the outer bits
+		make_faces(stl, v, thickness, 0, -thickness, 0, 0, 0);
+		//make_faces(stl, v, thickness, inset_dist, hole_dist, hole_rad);
+		printf("}\n");
+
+
+		printf("} // difference\n");
+
+		// add back in the mounting pegs
+		make_faces(stl, v, 0, 0, 0, hole_dist, hole_rad, thickness);
+		printf("} // union\n");
 
 		break;
 		//if (i == 0) break; // only do one right now
 	}
 
+	refframe_t avg;
+	refframe_init(&avg, avg_x, avg_y, avg_z);
+	printf("%%");
+	print_multmatrix(&avg, 1);
+	//printf("translate([0,0,20]) sphere(r=2);\n");
+	printf("cube([50,50,50], center=true);\n");
 	return 0;
 }

tetrahedron.scad

@@ -16,4 +16,4 @@ module tetrahedron()
 	);
 }
 
-scale(100) tetrahedron();
+scale(50) tetrahedron();