Add merge shared vertices option for obj export

base/sources/box_export.ts

@@ -32,6 +32,7 @@ let box_export_color_spaces: string[] = [
 let _box_export_bake_material: bool;
 let _box_export_t: export_preset_texture_t;
 let _box_export_apply_displacement: bool;
+let _box_export_merge_vertices: bool;
 
 function box_export_show_textures() {
 	ui_box_show_custom(function (ui: ui_t) {
@@ -356,7 +357,7 @@ function box_export_show_mesh() {
 	ui_box_show_custom(function (ui: ui_t) {
 		let htab: ui_handle_t = ui_handle(__ID__);
 		box_export_tab_export_mesh(ui, htab);
-	});
+	}, 400, 240);
 }
 
 function box_export_tab_export_mesh(ui: ui_t, htab: ui_handle_t) {
@@ -381,6 +382,12 @@ function box_export_tab_export_mesh(ui: ui_t, htab: ui_handle_t) {
 
 		let apply_displacement: bool = ui_check(ui_handle(__ID__), tr("Apply Displacement"));
 
+		let hmerge: ui_handle_t = ui_handle(__ID__);
+		if (hmerge.init) {
+			hmerge.selected = true;
+		}
+		let merge_vertices: bool = ui_check(hmerge, tr("Merge Shared Vertices"));
+
 		let tris: i32 = 0;
 		let pos: i32 = box_export_mesh_handle.position;
 		let paint_objects: mesh_object_t[];
@@ -407,6 +414,7 @@ function box_export_tab_export_mesh(ui: ui_t, htab: ui_handle_t) {
 		if (ui_button(tr("Export"))) {
 			ui_box_hide();
 			_box_export_apply_displacement = apply_displacement;
+			_box_export_merge_vertices = merge_vertices;
 			ui_files_show(context_raw.export_mesh_format == mesh_format_t.OBJ ? "obj" : "arm", true, false, function (path: string) {
 				///if (arm_android || arm_ios)
 				let f: string = sys_title();
@@ -429,7 +437,7 @@ function box_export_tab_export_mesh(ui: ui_t, htab: ui_handle_t) {
 					paint_objects = [po];
 				}
 
-				export_mesh_run(path + path_sep + f, paint_objects, _box_export_apply_displacement);
+				export_mesh_run(path + path_sep + f, paint_objects, _box_export_apply_displacement, _box_export_merge_vertices);
 			});
 		}
 	}

base/sources/export_mesh.ts

@@ -1,10 +1,12 @@
 
-function export_mesh_run(path: string, paint_objects: mesh_object_t[] = null, apply_disp: bool = false) {
+function export_mesh_run(path: string, paint_objects: mesh_object_t[] = null, apply_disp: bool = false, merge_vertices: bool = true) {
 	if (paint_objects == null) {
 		paint_objects = project_paint_objects;
 	}
 	if (context_raw.export_mesh_format == mesh_format_t.OBJ) {
-		export_obj_run(path, paint_objects, apply_disp);
+		merge_vertices ?
+			export_obj_run(path, paint_objects, apply_disp) :
+			export_obj_run_fast(path, paint_objects);
 	}
 	else {
 		export_arm_run_mesh(path, paint_objects);

base/sources/export_obj.ts

@@ -177,3 +177,102 @@ function export_obj_run(path: string, paint_objects: mesh_object_t[], apply_disp
 	}
 	iron_file_save_bytes(path, o, 0);
 }
+
+function export_obj_run_fast(path: string, paint_objects: mesh_object_t[]) {
+	// Skips merging shared vertices
+
+	let o: u8[] = [];
+	export_obj_write_string(o, "# armorpaint.org\n");
+
+	let poff: i32 = 0;
+	let noff: i32 = 0;
+	let toff: i32 = 0;
+	for (let i: i32 = 0; i < paint_objects.length; ++i) {
+		let p: mesh_object_t = paint_objects[i];
+		let mesh: mesh_data_t = p.data;
+		let inv: f32 = 1 / 32767;
+		let sc: f32 = p.data.scale_pos * inv;
+		let posa: i16_array_t = mesh.vertex_arrays[0].values;
+		let nora: i16_array_t = mesh.vertex_arrays[1].values;
+		let texa: i16_array_t = mesh.vertex_arrays[2].values;
+
+		let pi: i32 = posa.length / 4;
+		let ni: i32 = pi;
+		let ti: i32 = pi;
+
+		export_obj_write_string(o, "o " + p.base.name + "\n");
+		for (let i: i32 = 0; i < pi; ++i) {
+			export_obj_write_string(o, "v ");
+			let f: f32 = posa[i * 4] * sc;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, " ");
+			f = posa[i * 4 + 2] * sc;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, " ");
+			f = -posa[i * 4 + 1] * sc;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, "\n");
+		}
+		for (let i: i32 = 0; i < ni; ++i) {
+			export_obj_write_string(o, "vn ");
+			let f: f32 = nora[i * 2] * inv;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, " ");
+			f = posa[i * 4 + 3] * inv;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, " ");
+			f = -nora[i * 2 + 1] * inv;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, "\n");
+		}
+		for (let i: i32 = 0; i < ti; ++i) {
+			export_obj_write_string(o, "vt ");
+			let f: f32 = texa[i * 2] * inv;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, " ");
+			f = 1.0 - texa[i * 2 + 1] * inv;
+			export_obj_write_string(o, f + "");
+			export_obj_write_string(o, "\n");
+		}
+
+		let inda: u32_array_t = mesh.index_arrays[0].values;
+		for (let i: i32 = 0; i < math_floor(inda.length / 3); ++i) {
+			let pi1: i32 = inda[i * 3    ] + 1 + poff;
+			let pi2: i32 = inda[i * 3 + 1] + 1 + poff;
+			let pi3: i32 = inda[i * 3 + 2] + 1 + poff;
+			let ni1: i32 = inda[i * 3    ] + 1 + noff;
+			let ni2: i32 = inda[i * 3 + 1] + 1 + noff;
+			let ni3: i32 = inda[i * 3 + 2] + 1 + noff;
+			let ti1: i32 = inda[i * 3    ] + 1 + toff;
+			let ti2: i32 = inda[i * 3 + 1] + 1 + toff;
+			let ti3: i32 = inda[i * 3 + 2] + 1 + toff;
+			export_obj_write_string(o, "f ");
+			export_obj_write_string(o, pi1 + "");
+			export_obj_write_string(o, "/");
+			export_obj_write_string(o, ti1 + "");
+			export_obj_write_string(o, "/");
+			export_obj_write_string(o, ni1 + "");
+			export_obj_write_string(o, " ");
+			export_obj_write_string(o, pi2 + "");
+			export_obj_write_string(o, "/");
+			export_obj_write_string(o, ti2 + "");
+			export_obj_write_string(o, "/");
+			export_obj_write_string(o, ni2 + "");
+			export_obj_write_string(o, " ");
+			export_obj_write_string(o, pi3 + "");
+			export_obj_write_string(o, "/");
+			export_obj_write_string(o, ti3 + "");
+			export_obj_write_string(o, "/");
+			export_obj_write_string(o, ni3 + "");
+			export_obj_write_string(o, "\n");
+		}
+		poff += pi;
+		noff += ni;
+		toff += ti;
+	}
+
+	if (!ends_with(path, ".obj")) {
+		path += ".obj";
+	}
+	iron_file_save_bytes(path, o, 0);
+}