diff --git a/.idea/misc.xml b/.idea/misc.xml
index e8c6c13..dc13bd2 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -5,6 +5,7 @@
     <sourceRoots>
       <file path="$PROJECT_DIR$/examples" />
       <file path="$PROJECT_DIR$/vis/include" />
+      <file path="$PROJECT_DIR$/vis/presets" />
       <file path="$PROJECT_DIR$/vis/shaders" />
       <file path="$PROJECT_DIR$/vis/src" />
     </sourceRoots>
diff --git a/vis/CMakeLists.txt b/vis/CMakeLists.txt
index 394e3c0..cb493cd 100644
--- a/vis/CMakeLists.txt
+++ b/vis/CMakeLists.txt
@@ -5,13 +5,24 @@ add_custom_command(
         COMMENT "copied shaders"
 )
 
+add_custom_target(presets ALL DEPENDS preset_output)
+add_custom_command(
+        OUTPUT preset_output
+        COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/presets ${CMAKE_CURRENT_BINARY_DIR}/presets
+        COMMENT "copied preses"
+)
+
+find_package(yaml-cpp REQUIRED)
+
 add_library(vis-util INTERFACE)
 target_include_directories(vis-util INTERFACE include)
 
 add_executable(vis src/main.cpp)
 target_include_directories(vis PRIVATE include)
-target_link_libraries(vis PRIVATE tc glad glm glfw)
-add_dependencies(vis shaders)
+target_link_libraries(vis PRIVATE tc glad glm glfw yaml-cpp)
+add_dependencies(vis shaders presets)
 
 add_executable(ctest src/combotest.cpp)
+target_link_libraries(ctest PRIVATE yaml-cpp)
 target_include_directories(ctest PRIVATE include)
+add_dependencies(ctest presets)
diff --git a/vis/include/geometry.hpp b/vis/include/geometry.hpp
index 5d3ff2f..c4f8093 100644
--- a/vis/include/geometry.hpp
+++ b/vis/include/geometry.hpp
@@ -43,7 +43,7 @@ struct Primitive {
 /**
  * Produce a list of all generators for the group context. The range [0..group.ngens).
  */
-std::vector<int> gens(const tc::Group &context) {
+std::vector<int> generators(const tc::Group &context) {
     std::vector<int> g_gens(context.ngens);
     std::iota(g_gens.begin(), g_gens.end(), 0);
     return g_gens;
@@ -194,9 +194,9 @@ std::vector<std::vector<Primitive<N>>> each_tile(
     const auto table = solve(context, g_gens, {});
     const auto path = solve(context, g_gens, sg_gens).path;
 
-    auto _gens = gens(context);
+    auto _gens = generators(context);
 
-    auto res = path.walk<std::vector<Primitive<N>>, int>(base, gens(context), [&](auto from, auto gen) {
+    auto res = path.walk<std::vector<Primitive<N>>, int>(base, generators(context), [&](auto from, auto gen) {
         return apply(from, table, gen);
     });
 
diff --git a/vis/presets/atlas-24-cell.yaml b/vis/presets/atlas-24-cell.yaml
new file mode 100644
index 0000000..2cc082c
--- /dev/null
+++ b/vis/presets/atlas-24-cell.yaml
@@ -0,0 +1,9 @@
+groups:
+  - symbol: [3, 4, 3, 2]
+    slices:
+      - root: [0.30, 0.03, 0.03, 0.03, 0.01]
+        color: [0.9, 0.3, 0.3]
+      - root: [1.00, 0.10, 0.10, 0.10, 0.02]
+        color: [0.3, 0.3, 0.3]
+        exclude:
+          - [0, 1, 2]
diff --git a/vis/presets/default.yaml b/vis/presets/default.yaml
new file mode 100644
index 0000000..2cc082c
--- /dev/null
+++ b/vis/presets/default.yaml
@@ -0,0 +1,9 @@
+groups:
+  - symbol: [3, 4, 3, 2]
+    slices:
+      - root: [0.30, 0.03, 0.03, 0.03, 0.01]
+        color: [0.9, 0.3, 0.3]
+      - root: [1.00, 0.10, 0.10, 0.10, 0.02]
+        color: [0.3, 0.3, 0.3]
+        exclude:
+          - [0, 1, 2]
diff --git a/vis/shaders/solid.fs.glsl b/vis/shaders/solid.fs.glsl
index d8f9b8a..232d04a 100644
--- a/vis/shaders/solid.fs.glsl
+++ b/vis/shaders/solid.fs.glsl
@@ -1,6 +1,6 @@
 #version 430
 
-layout(location=2) uniform vec4 col;
+layout(location=2) uniform vec3 col;
 
 layout(location=0) in vec3 pos;
 layout(location=2) in vec3 normal;
@@ -12,6 +12,6 @@ void main() {
     float bright = abs(dot(normal, normalize(vec3(-0.6, 1, 2))));
     bright = .6 + .3 * bright * depth;
 
-    color = col;
+    color = vec4(col, 1);
     color.xyz *= bright;
 }
diff --git a/vis/src/combotest.cpp b/vis/src/combotest.cpp
index 6438fba..dc2e294 100644
--- a/vis/src/combotest.cpp
+++ b/vis/src/combotest.cpp
@@ -1,15 +1,14 @@
-#include <combo_iterator.hpp>
 #include <iostream>
+#include <yaml-cpp/yaml.h>
+#include <string>
 
 int main() {
-    auto cs = Combos<int>({7, 2, 3}, 2);
+    auto cfg = YAML::LoadFile("presets/default.yaml");
 
-    auto beg = cs.begin();
-    auto end = cs.end();
-
-    while (beg != end) {
-        const auto &c = *(++beg);
-        for (const auto &e : c) std::cout << e << " ";
+    for (const auto &group : cfg["groups"]) {
+//        std::cout << group["symbol"] << std::endl;
+        auto s = group["symbol"].as<std::vector<int>>();
+        for (const auto e : s) std::cout << e << " ";
         std::cout << std::endl;
     }
 }
diff --git a/vis/src/main.cpp b/vis/src/main.cpp
index e9f531c..9c94fde 100644
--- a/vis/src/main.cpp
+++ b/vis/src/main.cpp
@@ -17,6 +17,7 @@
 #include <random>
 
 #include <chrono>
+#include <yaml-cpp/yaml.h>
 
 #ifdef _WIN32
 extern "C" {
@@ -54,11 +55,19 @@ Matrices build(GLFWwindow *window, float st) {
 }
 
 template<unsigned N, class T>
-auto hull(const tc::Group &group, T begin, T end) {
+auto hull(const tc::Group &group, T all_sg_gens, const std::vector<std::vector<int>> &exclude) {
     std::vector<std::vector<Primitive<N>>> parts;
-    auto g_gens = gens(group);
-    while (begin != end) {
-        const auto &sg_gens = *(++begin);
+    auto g_gens = generators(group);
+    for (const std::vector<int> &sg_gens : all_sg_gens) {
+        bool excluded = false;
+        for (const auto &test : exclude) {
+            if (sg_gens == test) {
+                excluded = true;
+                break;
+            }
+        }
+        if (excluded) continue;
+
         const auto &base = triangulate<N>(group, sg_gens);
         const auto &tiles = each_tile(base, group, g_gens, sg_gens);
         for (const auto &tile : tiles) {
@@ -108,12 +117,12 @@ public:
 template<unsigned N>
 struct Slice {
     GLenum mode;
-    vec4 color;
+    vec3 color;
     cgl::VertexArray vao;
     cgl::Buffer<vec4> vbo;
     cgl::Buffer<Primitive<N>> ibo;
 
-    Slice(GLenum mode, vec4 color) : mode(mode), color(color), vao(), ibo(), vbo() {}
+    Slice(GLenum mode, vec3 color) : mode(mode), color(color), vao(), ibo(), vbo() {}
 
     Slice(Slice &) = delete;
 
@@ -126,11 +135,12 @@ struct Slice {
     }
 
     template<class T, class C>
-    static Slice<N> build(const tc::Group &g, const C &coords, vec4 color, T begin, T end) {
+    static Slice<N> build(const tc::Group &g, const C &coords, vec3 color, T all_sg_gens,
+        const std::vector<std::vector<int>> &exclude) {
         Slice<N> res(GL_POINTS, color);
 
         res.vbo.put(points(g, coords));
-        res.ibo.put(merge<N>(hull<N>(g, begin, end)));
+        res.ibo.put(merge<N>(hull<N>(g, all_sg_gens, exclude)));
         res.vao.ipointer(0, res.ibo, 4, GL_UNSIGNED_INT);
 
         return res;
@@ -156,24 +166,39 @@ void run(GLFWwindow *window) {
         .stage(sh.slice)
         .stage(sh.solid);
 
-    auto group = tc::schlafli({5, 3, 3, 2});
+    auto scene = YAML::LoadFile("presets/default.yaml");
 
-    const auto combos = Combos<int>({0, 1, 2, 3, 4}, 3);
+    auto slices = std::vector<Slice<4>>();
 
-    const auto coord = (vec5) {1.0, 0.1, 0.1, 0.1, 0.025};
+    for (const auto &group_info : scene["groups"]) {
+        auto symbol = group_info["symbol"].as<std::vector<int>>();
+        auto group = tc::schlafli(symbol);
+        auto gens = generators(group);
 
-    auto slices = {
-        Slice<4>::build(
-            group,
-            coord * 0.3,
-            {0.9f, 0.3f, 0.3f, 1.0f},
-            combos.begin(), combos.end()),
-        Slice<4>::build(
-            group,
-            coord,
-            {0.3f, 0.3f, 0.3f, 1.0f},
-            combos.begin()++, combos.end()),
-    };
+        if (group_info["slices"].IsDefined()) {
+            for (const auto &slice_info : group_info["slices"]) {
+                auto root = slice_info["root"].as<vec5>();
+                auto color = slice_info["color"].as<vec3>();
+                auto exclude = std::vector<std::vector<int>>();
+
+                if (slice_info["exclude"].IsDefined()) {
+                    exclude = slice_info["exclude"].as<std::vector<std::vector<int>>>();
+                }
+
+                if (slice_info["subgroups"].IsDefined()) {
+                    auto subgroups = slice_info["subgroups"].as<std::vector<std::vector<int>>>();
+                    slices.push_back(Slice<4>::build(
+                        group, root, color, subgroups, exclude
+                    ));
+                } else {
+                    auto combos = Combos<int>(gens, 3);
+                    slices.push_back(Slice<4>::build(
+                        group, root, color, combos, exclude
+                    ));
+                }
+            }
+        }
+    }
 
     auto ubo = cgl::Buffer<Matrices>();
     glBindBufferBase(GL_UNIFORM_BUFFER, 1, ubo);
@@ -194,7 +219,7 @@ void run(GLFWwindow *window) {
         slice_pipe.bound([&]() {
             for (const auto &slice : slices) {
                 glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, slice.vbo);
-                glProgramUniform4fv(sh.solid, 2, 1, &slice.color.front());
+                glProgramUniform3fv(sh.solid, 2, 1, &slice.color.front());
                 slice.draw();
             }
         });