diff --git a/DataSpec/DNACommon/CMDL.hpp b/DataSpec/DNACommon/CMDL.hpp
index 7810962b2..49c7433fd 100644
--- a/DataSpec/DNACommon/CMDL.hpp
+++ b/DataSpec/DNACommon/CMDL.hpp
@@ -1129,7 +1129,7 @@ bool WriteCMDL(const HECL::ProjectPath& outPath, const HECL::ProjectPath& inPath
                                                   false, false, groupIdx);
 
                 endOff = targetMSet.materials.back().binarySize(endOff);
-                targetMSet.addMaterialEndOff(endOff);
+                targetMSet.head.addMaterialEndOff(endOff);
             }
 
             for (const HECL::ProjectPath& path : texPaths)
@@ -1139,7 +1139,7 @@ bool WriteCMDL(const HECL::ProjectPath& outPath, const HECL::ProjectPath& inPath
                 /* TODO: incorporate hecl hashes */
                 size_t search = relPath.find(_S("TXTR_"));
                 if (search != HECL::SystemString::npos)
-                    targetMSet.addTexture(relPath.c_str() + search + 5);
+                    targetMSet.head.addTexture(relPath.c_str() + search + 5);
                 else
                     LogDNACommon.report(LogVisor::FatalError, "unable to get hash from path");
             }
@@ -1259,9 +1259,9 @@ bool WriteCMDL(const HECL::ProjectPath& outPath, const HECL::ProjectPath& inPath
 
     /* Surfaces */
     GX::Primitive prim;
-    if (mesh.outputMode == Mesh::OutputTriangles)
+    if (mesh.topology == HECL::TopologyTriangles)
         prim = GX::TRIANGLES;
-    else if (mesh.outputMode == Mesh::OutputTriStrips)
+    else if (mesh.topology == HECL::TopologyTriStrips)
         prim = GX::TRIANGLESTRIP;
     else
         LogDNACommon.report(LogVisor::FatalError, "unrecognized mesh output mode");
@@ -1313,6 +1313,181 @@ bool WriteCMDL(const HECL::ProjectPath& outPath, const HECL::ProjectPath& inPath
     return true;
 }
 
+template <class MaterialSet, class SurfaceHeader, atUint32 Version>
+bool WriteHMDLCMDL(const HECL::ProjectPath& outPath, const HECL::ProjectPath& inPath, const Mesh& mesh)
+{
+    Header head;
+    head.magic = 0xDEADBABE;
+    head.version = 0x10000 | Version;
+    head.aabbMin = mesh.aabbMin.val;
+    head.aabbMax = mesh.aabbMax.val;
+    head.matSetCount = mesh.materialSets.size();
+    head.secCount = head.matSetCount + 5 + mesh.surfaces.size();
+    head.secSizes.reserve(head.secCount);
+
+    /* Lengths of padding to insert while writing */
+    std::vector<size_t> paddingSizes;
+    paddingSizes.reserve(head.secCount);
+
+    /* Build material sets */
+    std::vector<MaterialSet> matSets;
+    matSets.reserve(mesh.materialSets.size());
+    {
+        HECL::Frontend::Frontend FE;
+        for (const std::vector<Mesh::Material>& mset : mesh.materialSets)
+        {
+            matSets.emplace_back();
+            MaterialSet& targetMSet = matSets.back();
+            std::vector<HECL::ProjectPath> texPaths;
+            texPaths.reserve(mset.size()*4);
+            for (const Mesh::Material& mat : mset)
+            {
+                for (const HECL::ProjectPath& path : mat.texs)
+                {
+                    bool found = false;
+                    for (const HECL::ProjectPath& ePath : texPaths)
+                    {
+                        if (path == ePath)
+                        {
+                            found = true;
+                            break;
+                        }
+                    }
+                    if (!found)
+                        texPaths.push_back(path);
+                }
+            }
+
+            size_t endOff = 0;
+            for (const Mesh::Material& mat : mset)
+            {
+                std::string diagName = HECL::Format("%s:%s", inPath.getLastComponentUTF8(), mat.name.c_str());
+                targetMSet.materials.emplace_back(FE, diagName, mat, mat.iprops, texPaths);
+                endOff = targetMSet.materials.back().binarySize(endOff);
+                targetMSet.head.addMaterialEndOff(endOff);
+            }
+
+            for (const HECL::ProjectPath& path : texPaths)
+            {
+                const HECL::SystemString& relPath = path.getRelativePath();
+
+                /* TODO: incorporate hecl hashes */
+                size_t search = relPath.find(_S("TXTR_"));
+                if (search != HECL::SystemString::npos)
+                    targetMSet.head.addTexture(relPath.c_str() + search + 5);
+                else
+                    LogDNACommon.report(LogVisor::FatalError, "unable to get hash from path");
+            }
+
+            size_t secSz = targetMSet.binarySize(0);
+            size_t secSz32 = ROUND_UP_32(secSz);
+            head.secSizes.push_back(secSz32);
+            paddingSizes.push_back(secSz32 - secSz);
+        }
+    }
+
+    HECL::HMDLBuffers bufs = mesh.getHMDLBuffers();
+
+    /* Metadata */
+    size_t secSz = bufs.m_metaSz;
+    size_t secSz32 = ROUND_UP_32(secSz);
+    if (secSz32 == 0)
+        secSz32 = 32;
+    head.secSizes.push_back(secSz32);
+    paddingSizes.push_back(secSz32 - secSz);
+
+    /* VBO */
+    secSz = bufs.m_vboSz;
+    secSz32 = ROUND_UP_32(secSz);
+    if (secSz32 == 0)
+        secSz32 = 32;
+    head.secSizes.push_back(secSz32);
+    paddingSizes.push_back(secSz32 - secSz);
+
+    /* IBO */
+    secSz = bufs.m_iboSz;
+    secSz32 = ROUND_UP_32(secSz);
+    if (secSz32 == 0)
+        secSz32 = 32;
+    head.secSizes.push_back(secSz32);
+    paddingSizes.push_back(secSz32 - secSz);
+
+    /* Surface index */
+    std::vector<size_t> surfEndOffs;
+    surfEndOffs.reserve(bufs.m_surfaces.size());
+    secSz = bufs.m_surfaces.size() * 4 + 4;
+    secSz32 = ROUND_UP_32(secSz);
+    if (secSz32 == 0)
+        secSz32 = 32;
+    head.secSizes.push_back(secSz32);
+    paddingSizes.push_back(secSz32 - secSz);
+
+    /* Surfaces */
+    size_t endOff = 0;
+    for (const HECL::HMDLBuffers::Surface& surf : bufs.m_surfaces)
+    {
+        head.secSizes.push_back(64);
+        paddingSizes.push_back(0);
+        endOff += 64;
+        surfEndOffs.push_back(endOff);
+    }
+
+    /* Write sections */
+    Athena::io::FileWriter writer(outPath.getAbsolutePath());
+    head.write(writer);
+    std::vector<size_t>::const_iterator padIt = paddingSizes.cbegin();
+
+    /* Material Sets */
+    for (const MaterialSet& mset : matSets)
+    {
+        mset.write(writer);
+        writer.fill(atUint8(0), *padIt);
+        ++padIt;
+    }
+
+    /* Metadata */
+    writer.writeUBytes(bufs.m_metaData.get(), bufs.m_metaSz);
+    writer.fill(atUint8(0), *padIt);
+    ++padIt;
+
+    /* VBO */
+    writer.writeUBytes(bufs.m_vboData.get(), bufs.m_vboSz);
+    writer.fill(atUint8(0), *padIt);
+    ++padIt;
+
+    /* IBO */
+    writer.writeUBytes(bufs.m_iboData.get(), bufs.m_iboSz);
+    writer.fill(atUint8(0), *padIt);
+    ++padIt;
+
+    /* Surface index */
+    writer.writeUint32Big(surfEndOffs.size());
+    for (size_t off : surfEndOffs)
+        writer.writeUint32Big(off);
+    writer.fill(atUint8(0), *padIt);
+    ++padIt;
+
+    /* Surfaces */
+    for (const HECL::HMDLBuffers::Surface& surf : bufs.m_surfaces)
+    {
+        const Mesh::Surface& osurf = surf.m_origSurf;
+
+        SurfaceHeader header;
+        header.centroid = osurf.centroid;
+        header.matIdx = osurf.materialIdx;
+        header.reflectionNormal = osurf.reflectionNormal;
+        header.unk1 = surf.m_start;
+        header.unk2 = surf.m_count;
+        header.write(writer);
+
+        writer.fill(atUint8(0), *padIt);
+        ++padIt;
+    }
+
+    writer.close();
+    return true;
+}
+
 }
 }
 
diff --git a/DataSpec/DNAMP1/CMDL.hpp b/DataSpec/DNAMP1/CMDL.hpp
index 39c456865..ae4d3b8c2 100644
--- a/DataSpec/DNAMP1/CMDL.hpp
+++ b/DataSpec/DNAMP1/CMDL.hpp
@@ -53,7 +53,7 @@ struct CMDL
         /* Cook and re-extract test */
         HECL::ProjectPath tempOut = outPath.getWithExtension(_S(".recook"), true);
         HECL::BlenderConnection::DataStream ds = conn.beginData();
-        DNACMDL::Mesh mesh = ds.compileMesh(DNACMDL::Mesh::OutputTriStrips, -1);
+        DNACMDL::Mesh mesh = ds.compileMesh(HECL::TopologyTriStrips, -1);
         ds.close();
         DNACMDL::WriteCMDL<MaterialSet, DNACMDL::SurfaceHeader_1_2, 2>(tempOut, outPath, mesh);
 
@@ -108,6 +108,34 @@ struct CMDL
             return false;
         return true;
     }
+
+    static bool HMDLCook(const HECL::ProjectPath& outPath,
+                         const HECL::ProjectPath& inPath,
+                         const DNACMDL::Mesh& mesh)
+    {
+        HECL::ProjectPath tempOut = outPath.getWithExtension(_S(".recook"));
+        if (mesh.skins.size())
+        {
+            if (!DNACMDL::WriteHMDLCMDL<HMDLMaterialSet, DNACMDL::SurfaceHeader_1_2, 2>(tempOut, inPath, mesh))
+                return false;
+
+            /* Output skinning intermediate */
+            Athena::io::FileWriter writer(outPath.getWithExtension(_S(".skin")).getAbsolutePath());
+            writer.writeUint32Big(mesh.skinBanks.banks.size());
+            for (const DNACMDL::Mesh::SkinBanks::Bank& sb : mesh.skinBanks.banks)
+            {
+                writer.writeUint32Big(sb.m_boneIdxs.size());
+                for (uint32_t bind : sb.m_boneIdxs)
+                    writer.writeUint32Big(bind);
+            }
+            writer.writeUint32Big(mesh.boneNames.size());
+            for (const std::string& boneName : mesh.boneNames)
+                writer.writeString(boneName);
+        }
+        else if (!DNACMDL::WriteHMDLCMDL<HMDLMaterialSet, DNACMDL::SurfaceHeader_1_2, 2>(tempOut, inPath, mesh))
+            return false;
+        return true;
+    }
 };
 
 }
diff --git a/DataSpec/DNAMP1/CMDLMaterials.cpp b/DataSpec/DNAMP1/CMDLMaterials.cpp
index 749287874..d556b92b6 100644
--- a/DataSpec/DNAMP1/CMDLMaterials.cpp
+++ b/DataSpec/DNAMP1/CMDLMaterials.cpp
@@ -1139,7 +1139,7 @@ MaterialSet::Material::Material(const HECL::Backend::GX& gx,
             {
                 found = true;
                 ++uvAnimsCount;
-                uvAnims.emplace_back(tcg);
+                uvAnims.emplace_back(tcg.m_gameFunction, tcg.m_gameArgs);
                 uvAnimsSize = uvAnims.back().binarySize(uvAnimsSize);
                 break;
             }
@@ -1149,62 +1149,151 @@ MaterialSet::Material::Material(const HECL::Backend::GX& gx,
     }
 }
 
-MaterialSet::Material::UVAnimation::UVAnimation(const HECL::Backend::GX::TexCoordGen& tcg)
+HMDLMaterialSet::Material::Material(HECL::Frontend::Frontend& FE,
+                                    const std::string& diagName,
+                                    const HECL::BlenderConnection::DataStream::Mesh::Material& mat,
+                                    const std::unordered_map<std::string, int32_t>& iprops,
+                                    const std::vector<HECL::ProjectPath>& texPaths)
 {
-    if (!tcg.m_gameFunction.compare("RetroUVMode0Node"))
+    auto search = iprops.find("retro_depth_sort");
+    if (search != iprops.end())
+        flags.setDepthSorting(search->second != 0);
+
+    search = iprops.find("retro_punchthrough_alpha");
+    if (search != iprops.end())
+        flags.setPunchthroughAlpha(search->second != 0);
+
+    search = iprops.find("retro_samus_reflection");
+    if (search != iprops.end())
+        flags.setSamusReflection(search->second != 0);
+
+    search = iprops.find("retro_depth_write");
+    if (search != iprops.end())
+        flags.setDepthWrite(search->second != 0);
+
+    search = iprops.find("retro_samus_reflection_persp");
+    if (search != iprops.end())
+        flags.setSamusReflectionSurfaceEye(search->second != 0);
+
+    search = iprops.find("retro_shadow_occluder");
+    if (search != iprops.end())
+        flags.setShadowOccluderMesh(search->second != 0);
+
+    search = iprops.find("retro_samus_reflection_indirect");
+    if (search != iprops.end())
+        flags.setSamusReflectionIndirectTexture(search->second != 0);
+
+    search = iprops.find("retro_lightmapped");
+    if (search != iprops.end())
+        flags.setLightmap(search->second != 0);
+
+    for (const HECL::ProjectPath& path : mat.texs)
+    {
+        size_t idx = 0;
+        for (const HECL::ProjectPath& tPath : texPaths)
+        {
+            if (path == tPath)
+            {
+                textureIdxs.push_back(idx);
+                ++textureCount;
+                break;
+            }
+            ++idx;
+        }
+    }
+
+    if (flags.samusReflectionIndirectTexture())
+        indTexSlot.push_back(textureIdxs.size());
+
+    heclSource = mat.source;
+    heclIr = FE.compileSource(mat.source, diagName);
+
+    uvAnimsSize = 4;
+    uvAnimsCount = 0;
+    for (const HECL::Frontend::IR::Instruction& inst : heclIr.m_instructions)
+    {
+        if (inst.m_op != HECL::Frontend::IR::OpCall)
+            continue;
+        if (inst.m_call.m_name.compare("Texture"))
+            continue;
+
+        const HECL::Frontend::IR::Instruction& sourceInst = inst.getChildInst(heclIr, 1);
+        if (sourceInst.m_op != HECL::Frontend::IR::OpCall)
+            continue;
+        if (sourceInst.m_call.m_name.compare(0, 11, "RetroUVMode"))
+            continue;
+
+        std::vector<atVec4f> gameArgs;
+        gameArgs.reserve(inst.getChildCount() - 1);
+        for (int i=1 ; i<inst.getChildCount() ; ++i)
+        {
+            const HECL::Frontend::IR::Instruction& ci = sourceInst.getChildInst(heclIr, i);
+            gameArgs.push_back(ci.getImmVec());
+        }
+
+        ++uvAnimsCount;
+        uvAnims.emplace_back(sourceInst.m_call.m_name, gameArgs);
+        uvAnimsSize = uvAnims.back().binarySize(uvAnimsSize);
+    }
+}
+
+MaterialSet::Material::UVAnimation::UVAnimation(const std::string& gameFunction,
+                                                const std::vector<atVec4f>& gameArgs)
+{
+    if (!gameFunction.compare("RetroUVMode0Node"))
         mode = ANIM_MV_INV_NOTRANS;
-    else if (!tcg.m_gameFunction.compare("RetroUVMode1Node"))
+    else if (!gameFunction.compare("RetroUVMode1Node"))
         mode = ANIM_MV_INV;
-    else if (!tcg.m_gameFunction.compare("RetroUVMode2Node"))
+    else if (!gameFunction.compare("RetroUVMode2Node"))
     {
         mode = ANIM_SCROLL;
-        if (tcg.m_gameArgs.size() < 2)
+        if (gameArgs.size() < 2)
             Log.report(LogVisor::FatalError, "Mode2 UV anim requires 2 vector arguments");
-        vals[0] = tcg.m_gameArgs[0].vec[0];
-        vals[1] = tcg.m_gameArgs[0].vec[1];
-        vals[2] = tcg.m_gameArgs[1].vec[0];
-        vals[3] = tcg.m_gameArgs[1].vec[1];
+        vals[0] = gameArgs[0].vec[0];
+        vals[1] = gameArgs[0].vec[1];
+        vals[2] = gameArgs[1].vec[0];
+        vals[3] = gameArgs[1].vec[1];
     }
-    else if (!tcg.m_gameFunction.compare("RetroUVMode3Node"))
+    else if (!gameFunction.compare("RetroUVMode3Node"))
     {
         mode = ANIM_ROTATION;
-        if (tcg.m_gameArgs.size() < 2)
+        if (gameArgs.size() < 2)
             Log.report(LogVisor::FatalError, "Mode3 UV anim requires 2 arguments");
-        vals[0] = tcg.m_gameArgs[0].vec[0];
-        vals[1] = tcg.m_gameArgs[1].vec[0];
+        vals[0] = gameArgs[0].vec[0];
+        vals[1] = gameArgs[1].vec[0];
     }
-    else if (!tcg.m_gameFunction.compare("RetroUVMode4Node"))
+    else if (!gameFunction.compare("RetroUVMode4Node"))
     {
         mode = ANIM_HSTRIP;
-        if (tcg.m_gameArgs.size() < 4)
+        if (gameArgs.size() < 4)
             Log.report(LogVisor::FatalError, "Mode4 UV anim requires 4 arguments");
-        vals[0] = tcg.m_gameArgs[0].vec[0];
-        vals[1] = tcg.m_gameArgs[1].vec[0];
-        vals[2] = tcg.m_gameArgs[2].vec[0];
-        vals[3] = tcg.m_gameArgs[3].vec[0];
+        vals[0] = gameArgs[0].vec[0];
+        vals[1] = gameArgs[1].vec[0];
+        vals[2] = gameArgs[2].vec[0];
+        vals[3] = gameArgs[3].vec[0];
     }
-    else if (!tcg.m_gameFunction.compare("RetroUVMode5Node"))
+    else if (!gameFunction.compare("RetroUVMode5Node"))
     {
         mode = ANIM_VSTRIP;
-        if (tcg.m_gameArgs.size() < 4)
+        if (gameArgs.size() < 4)
             Log.report(LogVisor::FatalError, "Mode5 UV anim requires 4 arguments");
-        vals[0] = tcg.m_gameArgs[0].vec[0];
-        vals[1] = tcg.m_gameArgs[1].vec[0];
-        vals[2] = tcg.m_gameArgs[2].vec[0];
-        vals[3] = tcg.m_gameArgs[3].vec[0];
+        vals[0] = gameArgs[0].vec[0];
+        vals[1] = gameArgs[1].vec[0];
+        vals[2] = gameArgs[2].vec[0];
+        vals[3] = gameArgs[3].vec[0];
     }
-    else if (!tcg.m_gameFunction.compare("RetroUVMode6Node"))
+    else if (!gameFunction.compare("RetroUVMode6Node"))
         mode = ANIM_MODEL;
-    else if (!tcg.m_gameFunction.compare("RetroUVMode7Node"))
+    else if (!gameFunction.compare("RetroUVMode7Node"))
     {
         mode = ANIM_MODE_WHO_MUST_NOT_BE_NAMED;
-        if (tcg.m_gameArgs.size() < 2)
+        if (gameArgs.size() < 2)
             Log.report(LogVisor::FatalError, "Mode7 UV anim requires 2 arguments");
-        vals[0] = tcg.m_gameArgs[0].vec[0];
-        vals[1] = tcg.m_gameArgs[1].vec[0];
+        vals[0] = gameArgs[0].vec[0];
+        vals[1] = gameArgs[1].vec[0];
     }
     else
-        Log.report(LogVisor::FatalError, "unsupported UV anim '%s'", tcg.m_gameFunction.c_str());
+        Log.report(LogVisor::FatalError, "unsupported UV anim '%s'", gameFunction.c_str());
 }
 
 }
diff --git a/DataSpec/DNAMP1/CMDLMaterials.hpp b/DataSpec/DNAMP1/CMDLMaterials.hpp
index fea1e3268..b8fb8880a 100644
--- a/DataSpec/DNAMP1/CMDLMaterials.hpp
+++ b/DataSpec/DNAMP1/CMDLMaterials.hpp
@@ -24,9 +24,10 @@ struct MaterialSet : BigDNA
         Vector<UniqueID32, DNA_COUNT(textureCount)> textureIDs;
         Value<atUint32> materialCount = 0;
         Vector<atUint32, DNA_COUNT(materialCount)> materialEndOffs;
+
+        void addTexture(const UniqueID32& id) {textureIDs.push_back(id); ++textureCount;}
+        void addMaterialEndOff(atUint32 off) {materialEndOffs.push_back(off); ++materialCount;}
     } head;
-    void addTexture(const UniqueID32& id) {head.textureIDs.push_back(id); ++head.textureCount;}
-    void addMaterialEndOff(atUint32 off) {head.materialEndOffs.push_back(off); ++head.materialCount;}
 
     struct Material : BigDNA
     {
@@ -370,7 +371,8 @@ struct MaterialSet : BigDNA
             }
 
             UVAnimation() = default;
-            UVAnimation(const HECL::Backend::GX::TexCoordGen& tcg);
+            UVAnimation(const std::string& gameFunction,
+                        const std::vector<atVec4f>& gameArgs);
         };
         Vector<UVAnimation, DNA_COUNT(uvAnimsCount)> uvAnims;
 
@@ -455,6 +457,40 @@ struct MaterialSet : BigDNA
 
 };
 
+struct HMDLMaterialSet : BigDNA
+{
+    static constexpr bool OneSection() {return false;}
+
+    DECL_DNA
+    MaterialSet::MaterialSetHead head;
+
+    struct Material : BigDNA
+    {
+        DECL_DNA
+        MaterialSet::Material::Flags flags;
+
+        Value<atUint32> textureCount = 0;
+        Vector<atUint32, DNA_COUNT(textureCount)> textureIdxs;
+
+        Vector<atUint32, DNA_COUNT(flags.samusReflectionIndirectTexture())> indTexSlot;
+
+        Value<atUint32> uvAnimsSize = 4;
+        Value<atUint32> uvAnimsCount = 0;
+        Vector<MaterialSet::Material::UVAnimation, DNA_COUNT(uvAnimsCount)> uvAnims;
+
+        String<-1> heclSource;
+        HECL::Frontend::IR heclIr;
+
+        Material() = default;
+        Material(HECL::Frontend::Frontend& FE,
+                 const std::string& diagName,
+                 const HECL::BlenderConnection::DataStream::Mesh::Material& mat,
+                 const std::unordered_map<std::string, int32_t>& iprops,
+                 const std::vector<HECL::ProjectPath>& texPaths);
+    };
+    Vector<Material, DNA_COUNT(head.materialCount)> materials;
+};
+
 }
 }
 
diff --git a/DataSpec/SpecMP1.cpp b/DataSpec/SpecMP1.cpp
index 667d50025..a4eb3f67c 100644
--- a/DataSpec/SpecMP1.cpp
+++ b/DataSpec/SpecMP1.cpp
@@ -289,7 +289,7 @@ struct SpecMP1 : SpecBase
     void cookMesh(const HECL::ProjectPath& out, const HECL::ProjectPath& in,
                   BlendStream& ds, bool fast, FCookProgress progress) const
     {
-        Mesh mesh = ds.compileMesh(fast ? Mesh::OutputTriangles : Mesh::OutputTriStrips, -1,
+        Mesh mesh = ds.compileMesh(fast ? HECL::TopologyTriangles : HECL::TopologyTriStrips, -1,
         [&progress](int surfCount)
         {
             progress(HECL::SysFormat(_S("%d"), surfCount).c_str());
diff --git a/hecl b/hecl
index 0bf9065e4..d4460a397 160000
--- a/hecl
+++ b/hecl
@@ -1 +1 @@
-Subproject commit 0bf9065e42a62675aefcb139d808c493a0926de8
+Subproject commit d4460a3970f70e56248464533448169f81301ce3