option to specify padding

Author: aothms

voxec.cpp

@@ -247,3 +247,11 @@ scope_map run(const std::vector<statement_type>& statements, double size, size_t
 
 	return context;
 }
+
+size_t padding_ = 32;
+size_t get_padding() {
+	return padding_;
+}
+void set_padding(size_t v) {
+	padding_ = v;
+}

voxec.h

@@ -56,6 +56,9 @@ struct filtered_files_t {};
 #define DIRSEP "/"
 #endif
 
+size_t get_padding();
+void set_padding(size_t);
+
 typedef boost::variant<boost::blank, filtered_files_t, geometry_collection_t*, abstract_voxel_storage*, function_arg_value_type> symbol_value;
 
 class voxel_operation;
@@ -435,19 +438,17 @@ namespace {
 			BRepBndLib::Add(p.second, global_bounds);
 		}
 
-		const size_t PADDING = 32U;
-
 		global_bounds.Get(x1, y1, z1, x2, y2, z2);
 		nx = (int)ceil((x2 - x1) / vsize);
 		ny = (int)ceil((y2 - y1) / vsize);
 		nz = (int)ceil((z2 - z1) / vsize);
 
-		x1 -= vsize * PADDING;
-		y1 -= vsize * PADDING;
-		z1 -= vsize * PADDING;
-		nx += PADDING * 2;
-		ny += PADDING * 2;
-		nz += PADDING * 2;
+		x1 -= vsize * get_padding();
+		y1 -= vsize * get_padding();
+		z1 -= vsize * get_padding();
+		nx += get_padding() * 2;
+		ny += get_padding() * 2;
+		nz += get_padding() * 2;
 
 		std::unique_ptr<fill_volume_t> method;
 		if (use_volume) {

voxec_main.cpp

@@ -18,6 +18,7 @@ int main(int argc, char** argv) {
 		("log-file", po::value<std::string>(), "filename to log json message")
 		("threads,t", po::value<size_t>(), "number of parallel processing threads")
 		("size,d", po::value<double>(), "voxel size in meters")
+		("padding,p", po::value<size_t>(), "padding around geometry bounding box (default=32)")
 		("chunk,c", po::value<size_t>(), "chunk size in number of voxels")
 		("mmap,m", "use memory-mapped files instead of pure RAM")
 		("mesh", "emit obj mesh for the last instruction")
@@ -53,6 +54,10 @@ int main(int argc, char** argv) {
 		d = vmap["size"].as<double>();
 	}
 
+	if (vmap.count("padding")) {
+		set_padding(vmap["padding"].as<size_t>());
+	}
+
 	boost::optional<size_t> threads, chunk;
 
 	if (vmap.count("threads")) {