diff --git a/vis/include/cgl/buffer.hpp b/vis/include/cgl/buffer.hpp
index 57b0977..0cc9369 100644
--- a/vis/include/cgl/buffer.hpp
+++ b/vis/include/cgl/buffer.hpp
@@ -53,8 +53,12 @@ namespace cgl {
             glNamedBufferData(id, sizeof(T), &data, usage);
         }
 
-        void put(const std::vector<T> &data, GLenum usage = GL_STATIC_DRAW) {
-            glNamedBufferData(id, sizeof(T) * data.size(), &data[0], usage);
+        template<typename It>
+        void put(It begin, It end, GLenum usage = GL_STATIC_DRAW) {
+            glNamedBufferData(id, sizeof(T) * (end - begin), nullptr, usage);
+            void* ptr = glMapNamedBuffer(id, GL_WRITE_ONLY);
+            std::copy(begin, end, (T*) ptr);
+            glUnmapNamedBuffer(id);
         }
 
         void bound(GLenum target, const std::function<void()> &action) const {
diff --git a/vis/src/main.cpp b/vis/src/main.cpp
index 04c3c54..589934f 100644
--- a/vis/src/main.cpp
+++ b/vis/src/main.cpp
@@ -153,8 +153,10 @@ struct SliceProp : public Prop<N> {
     ) {
         SliceProp<N> res(color);
 
-        res.vbo.put(points(g, coords));
-        res.ibo.put(merge<N>(hull<N>(g, all_sg_gens, exclude)));
+        auto pts = points(g, coords);
+        res.vbo.put(pts.begin(), pts.end());
+        auto inds = merge<N>(hull<N>(g, all_sg_gens, exclude));
+        res.ibo.put(inds.begin(), inds.end());
         res.vao.ipointer(0, res.ibo, 4, GL_UNSIGNED_INT);
 
         return res;
@@ -244,8 +246,10 @@ struct WireframeProp : public Prop<2> {
     ) {
         WireframeProp res(color);
 
-        res.vbo.put(points(g, coords));
-        res.ibo.put(merge<2>(hull<2>(g, all_sg_gens, exclude)));
+        auto pts = points(g, coords);
+        res.vbo.put(pts.begin(), pts.end());
+        auto inds = merge<2>(hull<2>(g, all_sg_gens, exclude));
+        res.ibo.put(inds.begin(), inds.end());
 
         return res;
     }