diff --git a/vis/include/cgl/render.hpp b/vis/include/cgl/render.hpp
index 12daa26..cd35e24 100644
--- a/vis/include/cgl/render.hpp
+++ b/vis/include/cgl/render.hpp
@@ -78,7 +78,7 @@ namespace cgl {
             set_source(src);
 
             if (!compile())
-                throw shader_error(get_info_log());
+                throw shader_error<mode>(get_info_log());
         }
 
         static shader<mode> file(const std::string &name) {
@@ -188,7 +188,7 @@ namespace cgl {
             attach(sh);
 
             if (!link())
-                throw shader_error(get_info_log());
+                throw shader_error<mode>(get_info_log());
 
             detach(sh);
         }
diff --git a/vis/include/util.hpp b/vis/include/util.hpp
index 17d30ab..e4a1807 100644
--- a/vis/include/util.hpp
+++ b/vis/include/util.hpp
@@ -15,6 +15,7 @@ public:
     explicit gl_error(const char *string) : domain_error(string) {}
 };
 
+template<GLenum mode>
 class shader_error : public gl_error {
 public:
     explicit shader_error(const std::string &arg) : gl_error(arg) {}
@@ -106,7 +107,7 @@ GLuint utilCompileFiles(const GLenum type, const std::vector<std::string> &files
 
     if (getShaderCompileStatus(shader)) return shader;
 
-    throw shader_error(getShaderInfoLog(shader));
+    throw shader_error<GL_VERTEX_SHADER>(getShaderInfoLog(shader));
 }
 
 GLuint utilLinkProgram(const std::vector<GLuint> &shaders) {
diff --git a/vis/shaders/test/direct.glsl b/vis/shaders/test/direct.glsl
deleted file mode 100644
index 5fbc428..0000000
--- a/vis/shaders/test/direct.glsl
+++ /dev/null
@@ -1,16 +0,0 @@
-#version 430
-
-layout(std140, binding=0) uniform globals {
-    mat4 proj;
-    float time;
-};
-
-layout(location=0) in vec4 pos;
-
-out gl_PerVertex{
-    vec4 gl_Position;
-};
-
-void main() {
-    gl_Position = proj * pos;
-}
diff --git a/vis/shaders/test/white.glsl b/vis/shaders/test/white.glsl
deleted file mode 100644
index 24449f9..0000000
--- a/vis/shaders/test/white.glsl
+++ /dev/null
@@ -1,15 +0,0 @@
-#version 430
-
-layout(std140, binding=0) uniform globals {
-    mat4 proj;
-    float time;
-};
-
-out vec4 diffuse;
-
-void main() {
-    vec3 hue = vec3(time) + vec3(0, 2, 4) * 3.1415 / 6.0;
-    vec3 rgb = cos(hue) * 0.3 + vec3(0.7);
-
-    diffuse = vec4(rgb, 1);
-}
diff --git a/vis/src/main.cpp b/vis/src/main.cpp
index 55c0c5f..f8486a7 100644
--- a/vis/src/main.cpp
+++ b/vis/src/main.cpp
@@ -30,34 +30,27 @@ struct Matrices {
 
 template<unsigned N, class V>
 struct BufferMesh {
-    GLenum mode;
-    std::shared_ptr<cgl::vertexarray> vao;
-    std::shared_ptr<cgl::buffer<Primitive<N>>> ibo;
-    std::shared_ptr<cgl::buffer<V>> vbo;
+    GLenum mode{};
+    cgl::vertexarray vao{};
+    cgl::buffer<Primitive<N>> ibo{};
+    cgl::buffer<V> vbo{};
 
-    BufferMesh() = delete;
+    BufferMesh(GLenum mode) : mode(mode), vao(), ibo(), vbo() {}
 
     BufferMesh(BufferMesh &) = delete;
 
     BufferMesh(BufferMesh &&) = delete;
 
-    explicit BufferMesh(
-        GLenum mode,
-        std::shared_ptr<cgl::vertexarray> vao,
-        std::shared_ptr<cgl::buffer<Primitive<N>>> ibo,
-        std::shared_ptr<cgl::buffer<V>> vbo
-    ) : mode(mode), vao(vao), ibo(ibo), vbo(vbo) {}
-
     void draw_deferred() {
-        vao->bound([&]() {
-            glDrawArrays(GL_POINTS, 0, ibo->count() * N);
+        vao.bound([&]() {
+            glDrawArrays(GL_POINTS, 0, ibo.count() * N);
         });
     }
 
     void draw_direct() {
-        vao->bound([&]() {
-            ibo->bound(GL_ELEMENT_ARRAY_BUFFER, [&]() {
-                glDrawElements(mode, ibo->count() * N, GL_UNSIGNED_INT, nullptr);
+        vao.bound([&]() {
+            ibo.bound(GL_ELEMENT_ARRAY_BUFFER, [&]() {
+                glDrawElements(mode, ibo.count() * N, GL_UNSIGNED_INT, nullptr);
             });
         });
     }
@@ -159,13 +152,8 @@ void run(GLFWwindow *window) {
     auto group = tc::group::F4();
 
     auto wire_data = merge(poly_parts<2>(group));
-    BufferMesh<2, float> wires(
-        GL_LINES,
-        std::make_shared<cgl::vertexarray>(),
-        std::make_shared<cgl::buffer<Primitive<2>>(wire_data.prims()),
-        std::make_shared<cgl::buffer<float>>()
-    );
-//    DirectMesh<2> wires(GL_LINES, wire_data);
+    auto wires = BufferMesh<2, float>(GL_LINES);
+    wires.ibo.put(wire_data.prims);
 
     const auto slice_dark = glm::vec3(.5, .3, .7);
     const auto slice_light = glm::vec3(.9, .9, .95);
@@ -173,18 +161,29 @@ void run(GLFWwindow *window) {
     const auto slice_parts = poly_parts<4>(group);
     auto slice_data = merge(slice_parts);
 
-    auto slice_colors = std::vector<glm::vec4>(slice_data.size());
+    auto slice_colors = std::vector<glm::vec3>(slice_data.size());
     for (int i = 0, k = 0; i < slice_parts.size(); ++i) {
         auto fac = factor(i, slice_parts.size());
         glm::vec3 color = glm::mix(slice_dark, slice_light, fac);
 
         for (int j = 0; j < slice_parts[i].size(); ++j, ++k) {
-            slice_colors[k] = glm::vec4(color, 1);
+            slice_colors[k] = color;
         }
     }
-    cgl::buffer<glm::vec4> slice_colors_buf(slice_colors);
 
-//    DeferredMesh<4> slices(slice_data, slice_colors_buf);
+    BufferMesh<4, glm::vec3> slices(GL_POINTS);
+    slices.ibo.put(slice_data.prims);
+    slices.vbo.put(slice_colors);
+    slices.vao.bound([&]() {
+        slices.ibo.bound(GL_ARRAY_BUFFER, [&]() {
+            glEnableVertexAttribArray(0);
+            glVertexAttribIPointer(0, 4, GL_UNSIGNED_INT, 0, nullptr);
+            slices.vbo.bound(GL_ARRAY_BUFFER, [&]() {
+                glEnableVertexAttribArray(1);
+                glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
+            });
+        });
+    });
 
     auto vbo = cgl::buffer<glm::vec4>(points(group));
     glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, vbo);
@@ -207,12 +206,12 @@ void run(GLFWwindow *window) {
 
         glProgramUniform3f(sh.solid, 2, 0.3, 0.3, 0.3);
         proj_pipe.bound([&]() {
-            wires.draw();
+            wires.draw_direct();
         });
 
-//        slice_pipe.bound([&]() {
-//            slices.draw();
-//        });
+        slice_pipe.bound([&]() {
+            slices.draw_deferred();
+        });
 
         glfwSwapInterval(2);
         glfwSwapBuffers(window);