Merging OBJ Frames

[AGP]

I'm about to post a little project for anyone unable to export either Ogre or MD2-animated versions of their models but are able to export OBJ or 3ds. I found a little maxscript that automates the exporting of the frames, and I'm writing the jpct end of it. Problem is I keep getting a size difference of 1 between frame 1 and all the rest ("ERROR: The sizes of the Animation's Meshes (26938) and the object's Mesh (26937) don't match!").

Code Select Expand


/**
Written by AGP (BR) on May, 2018
*/
import java.io.*;
import com.threed.jpct.*;

public class MergeAndSerialize {
     public static void main(String[] args) {
Logger.setLogLevel(Logger.LL_ERRORS_AND_WARNINGS);
float SCALE = 3.6f;
String animationName = "Idle";
if (args == null || args.length < 1) {
     System.err.println("USAGE: java MergeAndSerialize [baseFileName] where the file name needs no extension.\nFOR OBJs ONLY.");
     return;
}
String fileName = args[0].trim();
FilenameFilter filter = new FilenameFilter() {
     public boolean accept(File dir, String name) {
return (name.startsWith(fileName) && name.toLowerCase().endsWith(".obj"));
     }
};
String[] frames = new File("./").list(filter);
Object3D model = Object3D.mergeAll(Loader.loadOBJ(frames[0], frames[0].substring(0, frames[0].lastIndexOf("."))+".mtl", SCALE));
Animation animation = new Animation(frames.length);
animation.createSubSequence(animationName);
System.out.println("\n\n\nFrames length: "+frames.length);
model.build();
for (int i = 1; i < frames.length; i++) {
System.out.println("I: "+i);
     Object3D frame = Object3D.mergeAll(Loader.loadOBJ(frames[i], frames[i].substring(0, frames[i].lastIndexOf("."))+".mtl", SCALE));
     frame.build();
     Mesh mesh = frame.getMesh();
     animation.addKeyFrame(mesh);
}
model.setAnimationSequence(animation);
try {
     new DeSerializer().serialize(model, new java.io.FileOutputStream(fileName.substring(0, fileName.lastIndexOf("."))+".serialized"), false);
}
catch (java.io.IOException ex) {System.err.println("Trouble saving file: "+ex.getMessage());}
java.awt.Toolkit.getDefaultToolkit().beep();
     }
}


[EgonOlsen]

Try to set http://www.jpct.net/doc/com/threed/jpct/Loader.html#setVertexOptimization(boolean) to false before loading the files.

[AGP]

I did. Same thing.

[EgonOlsen]

In that case, the mesh sizes are different in the file. Can you check the log output while loading them for any differences?

[AGP]

All of the OBJs have the exact same file size. The following is the output for the first few frames:

Loading file Catwoman000.mtl
Text file Catwoman000.mtl loaded...386 bytes
Processing new material CatSuit!
Texture named CatAtlas.png added to TextureManager!
Loading file Catwoman000.obj
Text file Catwoman000.obj loaded...5293896 bytes
Processing object from OBJ-file: CC_Base_Body
Processing object from OBJ-file: CC_Base_Body
Object 'CC_Base_Body_jPCT-2' created using 15500 polygons and 8068 vertices.
Processing object from OBJ-file: CC_Base_Tongue
Processing object from OBJ-file: CC_Base_Tongue
Object 'CC_Base_Tongue_jPCT-1' created using 592 polygons and 309 vertices.
Processing object from OBJ-file: CC_Base_Eye
Processing object from OBJ-file: CC_Base_Eye
Object 'CC_Base_Eye_jPCT0' created using 1088 polygons and 580 vertices.
Processing object from OBJ-file: CC_Base_Teeth
Processing object from OBJ-file: CC_Base_Teeth
Object 'CC_Base_Teeth_jPCT1' created using 4822 polygons and 2632 vertices.
Processing object from OBJ-file: Cat_Suit
Processing object from OBJ-file: Cat_Suit
Object 'Cat_Suit_jPCT2' created using 8647 polygons and 4407 vertices.
Processing object from OBJ-file: Bunny_Female
Processing object from OBJ-file: Bunny_Female
Object 'Bunny_Female_jPCT3' created using 1540 polygons and 819 vertices.
Processing object from OBJ-file: Fingerless_gloves
Processing object from OBJ-file: Fingerless_gloves
Object 'Fingerless_gloves_jPCT4' created using 2908 polygons and 1510 vertices.
Processing object from OBJ-file: Female_knee_boots
Processing object from OBJ-file: Female_knee_boots
Object 'Female_knee_boots_jPCT5' created using 2416 polygons and 1228 vertices.
Processing object from OBJ-file: RL_G6_Hair
Processing object from OBJ-file: RL_G6_Hair
Object 'RL_G6_Hair_jPCT6' created using 1266 polygons and 947 vertices.
Processing object from OBJ-file: RL_Face002
Processing object from OBJ-file: RL_Face002
Object 'RL_Face002_jPCT7' created using 12470 polygons and 6429 vertices.



Frames length: 345
I: 1
Loading file Catwoman001.mtl
Text file Catwoman001.mtl loaded...386 bytes
Processing new material CatSuit!
Loading file Catwoman001.obj
Text file Catwoman001.obj loaded...5294012 bytes
Processing object from OBJ-file: CC_Base_Body
Processing object from OBJ-file: CC_Base_Body
Object 'CC_Base_Body_jPCT9' created using 15500 polygons and 8068 vertices.
Processing object from OBJ-file: CC_Base_Tongue
Processing object from OBJ-file: CC_Base_Tongue
Object 'CC_Base_Tongue_jPCT10' created using 592 polygons and 309 vertices.
Processing object from OBJ-file: CC_Base_Eye
Processing object from OBJ-file: CC_Base_Eye
Object 'CC_Base_Eye_jPCT11' created using 1088 polygons and 580 vertices.
Processing object from OBJ-file: CC_Base_Teeth
Processing object from OBJ-file: CC_Base_Teeth
Object 'CC_Base_Teeth_jPCT12' created using 4822 polygons and 2632 vertices.
Processing object from OBJ-file: Cat_Suit
Processing object from OBJ-file: Cat_Suit
Object 'Cat_Suit_jPCT13' created using 8647 polygons and 4407 vertices.
Processing object from OBJ-file: Bunny_Female
Processing object from OBJ-file: Bunny_Female
Object 'Bunny_Female_jPCT14' created using 1540 polygons and 819 vertices.
Processing object from OBJ-file: Fingerless_gloves
Processing object from OBJ-file: Fingerless_gloves
Object 'Fingerless_gloves_jPCT15' created using 2908 polygons and 1510 vertices.
Processing object from OBJ-file: Female_knee_boots
Processing object from OBJ-file: Female_knee_boots
Object 'Female_knee_boots_jPCT16' created using 2416 polygons and 1228 vertices.
Processing object from OBJ-file: RL_G6_Hair
Processing object from OBJ-file: RL_G6_Hair
Object 'RL_G6_Hair_jPCT17' created using 1266 polygons and 947 vertices.
Processing object from OBJ-file: RL_Face002
Processing object from OBJ-file: RL_Face002
Object 'RL_Face002_jPCT18' created using 12471 polygons and 6430 vertices.
I: 2
Loading file Catwoman002.mtl
Text file Catwoman002.mtl loaded...386 bytes
Processing new material CatSuit!
Loading file Catwoman002.obj
Text file Catwoman002.obj loaded...5294007 bytes
Processing object from OBJ-file: CC_Base_Body
Processing object from OBJ-file: CC_Base_Body
Object 'CC_Base_Body_jPCT20' created using 15500 polygons and 8068 vertices.
Processing object from OBJ-file: CC_Base_Tongue
Processing object from OBJ-file: CC_Base_Tongue
Object 'CC_Base_Tongue_jPCT21' created using 592 polygons and 309 vertices.
Processing object from OBJ-file: CC_Base_Eye
Processing object from OBJ-file: CC_Base_Eye
Object 'CC_Base_Eye_jPCT22' created using 1088 polygons and 580 vertices.
Processing object from OBJ-file: CC_Base_Teeth
Processing object from OBJ-file: CC_Base_Teeth
Object 'CC_Base_Teeth_jPCT23' created using 4822 polygons and 2632 vertices.
Processing object from OBJ-file: Cat_Suit
Processing object from OBJ-file: Cat_Suit
Object 'Cat_Suit_jPCT24' created using 8647 polygons and 4407 vertices.
Processing object from OBJ-file: Bunny_Female
Processing object from OBJ-file: Bunny_Female
Object 'Bunny_Female_jPCT25' created using 1540 polygons and 819 vertices.
Processing object from OBJ-file: Fingerless_gloves
Processing object from OBJ-file: Fingerless_gloves
Object 'Fingerless_gloves_jPCT26' created using 2908 polygons and 1510 vertices.
Processing object from OBJ-file: Female_knee_boots
Processing object from OBJ-file: Female_knee_boots
Object 'Female_knee_boots_jPCT27' created using 2416 polygons and 1228 vertices.
Processing object from OBJ-file: RL_G6_Hair
Processing object from OBJ-file: RL_G6_Hair
Object 'RL_G6_Hair_jPCT28' created using 1266 polygons and 947 vertices.
Processing object from OBJ-file: RL_Face002
Processing object from OBJ-file: RL_Face002
Object 'RL_Face002_jPCT29' created using 12469 polygons and 6428 vertices.

[EgonOlsen]

No, they aren't. RL_Face002 for example differs from frame to frame by +-1 vertex in that log file.

[AGP]

Down to explorer's granularity they look identical at 5170 kb each. Anyway, I added the following block and am still getting that error message:

Code Select Expand


     if (mesh.getVertexCount() == vertexCount) {
animation.addKeyFrame(mesh);
usedFrames++;
     }


And the number of usedFrames is equal to the total number of frames.

[EgonOlsen]

Can you print out the actual values that you are comparing?

[AGP]

By testing the triangle, instead of the vertex, count I was able to create my file. It's kind of huge, and only 78 of the 345 frames went in. There are a couple of artifacts, like triangles that shouldn't be there appearing in front of the character, but in general it works. I will pack it with the MaxScript that I found and post it in projects.

[EgonOlsen]

Then something isn't identical between the meshes no matter what. If the vertex count would match, they would at least make it all into the animation. However, even then, the usage of these vertices in the triangles could be different as well, which is something that a keyframe animation can't deal with. The assigments of vertices to triangles have to stay the same in all files.

[AGP]

Maybe the OBJ exporter sorts them differently relative to their poses. All the same, I was ableto export a character this way that I otherwise would not. The project has been posted.