Updated CTM pipeline to use single concatenated file for multi-material models.

Added Python script for file concatenation with keeping track of file start offsets.

This single file way is a bit slower, but should be easier on server / workers (before every part spawned own worker, now all parts for a single model are handled by a single worker).

examples/ctm/camaro/camaro.js

 {
-"geometries" :
-	[
-	"camaro_000.ctm",
-	"camaro_001.ctm",
-	"camaro_002.ctm",
-	"camaro_003.ctm",
-	"camaro_004.ctm",
-	"camaro_005.ctm",
-	"camaro_006.ctm",
-	"camaro_007.ctm"
-	],
+"data" : "camaro.ctm",
+
+"offsets": [ 0, 39262, 79223, 83542, 94677, 95890, 144902, 470461 ],
 
 "materials" :
 	[

examples/js/ctm/CTMLoader.js

@@ -30,8 +30,6 @@ THREE.CTMLoader.prototype.loadParts = function( url, callback, useWorker, useBuf
 
 	basePath = basePath ? basePath : this.extractUrlbase( url );
 
-	console.log( basePath );
-
 	xhr.onreadystatechange = function() {
 
 		if ( xhr.readyState == 4 ) {
@@ -40,27 +38,23 @@ THREE.CTMLoader.prototype.loadParts = function( url, callback, useWorker, useBuf
 
 				var jsonObject = JSON.parse( xhr.responseText );
 
-				var geometries = [], materials = [];
-				var partCounter = 0;
-
-				function generateCallback( index ) {
+				var materials = [], geometries = [], counter = 0;
 
-					return function ( geometry ) {
+				function callbackFinal( geometry ) {
 
-						geometries[ index ] = geometry;
+					counter += 1;
 
-						partCounter += 1;
+					geometries.push( geometry );
 
-						if ( partCounter === jsonObject.geometries.length ) {
+					if ( counter === jsonObject.offsets.length ) {
 
-							callback( geometries, materials );
-
-						}
+						callback( geometries, materials );
 
 					}
 
 				}
 
+
 				// init materials
 
 				for ( var i = 0; i < jsonObject.materials.length; i ++ ) {
@@ -69,14 +63,10 @@ THREE.CTMLoader.prototype.loadParts = function( url, callback, useWorker, useBuf
 
 				}
 
-				// load individual CTM files
-
-				for ( var i = 0; i < jsonObject.geometries.length; i ++ ) {
+				// load joined CTM file
 
-					var partUrl = basePath + jsonObject.geometries[ i ];
-					scope.load( partUrl, generateCallback( i ), useWorker, useBuffers );
-
-				}
+				var partUrl = basePath + jsonObject.data;
+				scope.load( partUrl, callbackFinal, useWorker, useBuffers, jsonObject.offsets );
 
 			}
 
@@ -96,10 +86,12 @@ THREE.CTMLoader.prototype.loadParts = function( url, callback, useWorker, useBuf
 //		- url (required)
 //		- callback (required)
 
-THREE.CTMLoader.prototype.load = function( url, callback, useWorker, useBuffers ) {
+THREE.CTMLoader.prototype.load = function( url, callback, useWorker, useBuffers, offsets ) {
 
 	var scope = this;
 
+	offsets = offsets !== undefined ? offsets : [ 0 ];
+
 	var xhr = new XMLHttpRequest(),
 		callbackProgress = null;
 
@@ -121,15 +113,21 @@ THREE.CTMLoader.prototype.load = function( url, callback, useWorker, useBuffers
 
 					worker.onmessage = function( event ) {
 
-						var ctmFile = event.data;
+						var files = event.data;
 
-						if ( useBuffers ) {
+						for ( var i = 0; i < files.length; i ++ ) {
 
-							scope.createModelBuffers( ctmFile, callback );
+							var ctmFile = files[ i ];
 
-						} else {
+							if ( useBuffers ) {
 
-							scope.createModelClassic( ctmFile, callback );
+								scope.createModelBuffers( ctmFile, callback );
+
+							} else {
+
+								scope.createModelClassic( ctmFile, callback );
+
+							}
 
 						}
 
@@ -138,24 +136,32 @@ THREE.CTMLoader.prototype.load = function( url, callback, useWorker, useBuffers
 
 					};
 
-					worker.postMessage( binaryData );
+					worker.postMessage( { "data": binaryData, "offsets": offsets } );
 
 				} else {
 
-					var ctmFile = new CTM.File( new CTM.Stream( binaryData ) );
 
-					if ( useBuffers ) {
+					for ( var i = 0; i < offsets.length; i ++ ) {
+
+						var stream = new CTM.Stream( binaryData );
+						stream.offset = offsets[ i ];
+
+						var ctmFile = new CTM.File( stream );
+
+						if ( useBuffers ) {
+
+							scope.createModelBuffers( ctmFile, callback );
 
-						scope.createModelBuffers( ctmFile, callback );
+						} else {
 
-					} else {
+							scope.createModelClassic( ctmFile, callback );
 
-						scope.createModelClassic( ctmFile, callback );
+						}
 
 					}
 
-					var e = Date.now();
-					console.log( "CTM data parse time [inline]: " + (e-s) + " ms" );
+					//var e = Date.now();
+					//console.log( "CTM data parse time [inline]: " + (e-s) + " ms" );
 
 				}
 

examples/js/ctm/CTMWorker.js

@@ -2,7 +2,18 @@ importScripts( "lzma.js", "ctm.js" );
 
 self.onmessage = function( event ) {
 
-  self.postMessage( new CTM.File( new CTM.Stream( event.data ) ) );
-  self.close();
+	var files = [];
+
+	for ( var i = 0; i < event.data.offsets.length; i ++ ) {
+
+		var stream = new CTM.Stream( event.data.data );
+		stream.offset = event.data.offsets[ i ];
+
+		files[ i ] = new CTM.File( stream );
+
+	}
+
+	self.postMessage( files );
+	self.close();
 
 }

utils/exporters/ctm/join_ctm.py

+"""Join multiple binary files into single file and generate JSON snippet with offsets
+
+-------------------------------------
+How to use
+-------------------------------------
+
+python join_ctm.py -i "part_*.ctm" -o joined.ctm [-j offsets.js]
+
+Will read multiple files following wildcard pattern (ordered lexicographically):
+
+part_000.ctm
+part_001.ctm
+part_002.ctm
+
+...
+
+part_XXX.ctm
+
+And generate single concatenated files:
+
+joined.ctm
+offsets.js (optional, offsets are also dumped to standard output)
+
+"""
+
+import getopt
+import glob
+import sys
+import os
+
+# #####################################################
+# Templates
+# #####################################################
+TEMPLATE_JSON = u"""\
+"offsets": [ %(offsets)s ],
+"""
+
+# #############################################################################
+# Helpers
+# #############################################################################
+def usage():
+    print 'Usage: %s -i "filename_*.ctm" -o filename.ctm [-j offsets.js]' % os.path.basename(sys.argv[0])
+
+# #####################################################
+# Main
+# #####################################################
+if __name__ == "__main__":
+
+    # get parameters from the command line
+
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], "hi:o:j:", ["help", "input=", "output=", "json="])
+
+    except getopt.GetoptError:
+        usage()
+        sys.exit(2)
+
+
+    inpattern = ""
+    outname = ""
+    jsonname = ""
+
+    for o, a in opts:
+        if o in ("-h", "--help"):
+            usage()
+            sys.exit()
+
+        elif o in ("-i", "--input"):
+            inpattern = a
+
+        elif o in ("-o", "--output"):
+            outname = a
+
+        elif o in ("-j", "--json"):
+            jsonname = a
+
+    # quit if required parameters are missing
+
+    if inpattern == "" or outname == "":
+        usage()
+        sys.exit(2)
+
+    outfile = open(outname, "wb")
+
+    matches = glob.glob(inpattern)
+    matches.sort()
+
+    total = 0
+    offsets = []
+
+    for filename in matches:
+        filesize = os.path.getsize(filename)
+        offsets.append(total)
+        total += filesize
+
+        print filename, filesize
+
+        infile = open(filename, "rb")
+        buffer = infile.read()
+        outfile.write(buffer)
+        infile.close()
+
+    outfile.close()
+
+    json_str = TEMPLATE_JSON % {
+    "offsets" : ", ".join(["%d" % o for o in offsets])
+    }
+
+    print json_str
+
+    if jsonname:
+        jsonfile = open(jsonname, "w")
+        jsonfile.write(json_str)
+        jsonfile.close()
\ No newline at end of file

utils/exporters/obj/split_obj.py

 """Split single OBJ model into mutliple OBJ files by materials
 
--------------------------
-How to use this converter
--------------------------
+-------------------------------------
+How to use
+-------------------------------------
 
 python split_obj.py -i infile.obj -o outfile