@@ -0,0 +72,4 @@
+    bm_convert_params.calc_face_normal = true;
+    bm_convert_params.calc_vert_normal = false;
+
+    BMesh *bmesh = BKE_mesh_to_bmesh_ex(mesh, &bm_create_params, &bm_convert_params);

@@ -25,0 +47,4 @@
+  export_params.forward_axis = RNA_enum_get(op->ptr, "forward_axis");
+  export_params.up_axis = RNA_enum_get(op->ptr, "up_axis");
+  export_params.global_scale = RNA_float_get(op->ptr, "global_scale");
+  export_params.use_apply_modifiers = RNA_boolean_get(op->ptr, "use_apply_modifiers");

@@ -25,0 +48,4 @@
+  export_params.up_axis = RNA_enum_get(op->ptr, "up_axis");
+  export_params.global_scale = RNA_float_get(op->ptr, "global_scale");
+  export_params.use_apply_modifiers = RNA_boolean_get(op->ptr, "use_apply_modifiers");
+  export_params.use_selection_only = RNA_boolean_get(op->ptr, "use_selection_only");

@@ -25,0 +49,4 @@
+  export_params.global_scale = RNA_float_get(op->ptr, "global_scale");
+  export_params.use_apply_modifiers = RNA_boolean_get(op->ptr, "use_apply_modifiers");
+  export_params.use_selection_only = RNA_boolean_get(op->ptr, "use_selection_only");
+  export_params.use_ascii = RNA_boolean_get(op->ptr, "use_ascii");

@@ -28,0 +35,4 @@
+  bool use_apply_modifiers;
+  bool use_ascii;
+  bool use_batch;
+  float global_scale;

@@ -0,0 +21,4 @@
+
+class ASCIIFileWriter : public FileWriter, NonCopyable {
+ private:
+  std::ofstream file_;

@@ -0,0 +42,4 @@
+
+BinaryFileWriter::BinaryFileWriter(const char *filepath)
+{
+  file_ = fopen(filepath, "wb");

@@ -14,14 +14,162 @@
 
 #  include "DNA_space_types.h"

@@ -0,0 +85,4 @@
+    }
+    float scale_vec[3] = {global_scale, global_scale, global_scale};
+    float obmat3x3[3][3];
+    unit_m3(obmat3x3);

@@ -0,0 +95,4 @@
+    rescale_m4(obmat4x4, scale_vec);
+
+    /* Write triangles. */
+    auto loops = mesh->loops();

@@ -0,0 +99,4 @@
+    for (const auto &loop_tri : mesh->looptris()) {
+      Triangle t{};
+      for (int i = 0; i < 3; i++) {
+        auto co = mesh->vert_positions()[loops[loop_tri.tri[i]].v];

@@ -0,0 +20,4 @@
+
+#pragma pack(push, 1)
+struct STLBinaryTriangle {
+  float normal[3]{};

@@ -0,0 +22,4 @@
+struct STLBinaryTriangle {
+  float normal[3]{};
+  float vertices[3][3]{};
+  uint16_t attribute_byte_count{};

@@ -0,0 +18,4 @@
+  if (type == FileWriter::Type::ASCII) {
+    return std::make_unique<ASCIIFileWriter>(filepath);
+  }
+  else if (type == FileWriter::Type::BINARY) {

@@ -0,0 +96,4 @@
+    rescale_m4(obmat4x4, scale_vec);
+
+    /* Write triangles. */
+    const Span<float3> vertices = mesh->vert_positions();