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Moving and Rotating a Complex Model

ProfessorF

By ProfessorF,
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ProfessorF Newbie

ProfessorF

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Posted

Sorry this is long, but the problem is kind of confusing.  Okay, so I have a neighborhood with many houses.  In unity3d or Maya, it looks something like this:

 

Bb3ISWlIQAAxdRy.jpg

 

But importing the neighborhood with all the houses is huge and causes problems. So I want to import the neighborhood separate, and then import / duplicate the houses.  Here is ONE neighborhood and ONE house BUT THE HOUSE IS NOT POSITIONED YET:

 

                BABYLON.SceneLoader.ImportMesh("", "neighborhood_terrain/", "neighborhood_terrain.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    newMeshes[0].position = new BABYLON.Vector3(0, 0, 0);  
                });
                BABYLON.SceneLoader.ImportMesh("", "house_A/", "house_A.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    newMeshes[0].position = new BABYLON.Vector3(0, 0, 0);
                });
 
post-5799-0-58446700-1387506567.png

 

The correct position for the house is (-431.1,0,-29.5)

The correct rotation is Math.PI/2

 

You would expect that this code works:

                BABYLON.SceneLoader.ImportMesh("", "neighborhood_terrain/", "neighborhood_terrain.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    newMeshes[0].position = new BABYLON.Vector3(0, 0, 0);  
                });
                BABYLON.SceneLoader.ImportMesh("", "house_A/", "house_A.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    newMeshes[0].position = new BABYLON.Vector3(-431.1, 0, -29.5);
                    newMeshes[0].rotation.y = Math.PI / 2;
                });
 
But it does not:
 
post-5799-0-96260000-1387506884.png
 

So I decided to transform all the meshes in a loop:

 

                BABYLON.SceneLoader.ImportMesh("", "house_A/", "house_A.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    //newMeshes[0].position = new BABYLON.Vector3(-431.1, 0, -29.5);
                    //newMeshes[0].rotation.y = Math.PI / 2;
                    for (j = 1; j < newMeshes.length; j++) {
                                newMeshes[j].position.x = -431.1;
                                newMeshes[j].position.y = 0;
                                newMeshes[j].position.z = -29.5;
                                newMeshes[j].rotation.y = Math.PI / 2;
                    }
 
                });
 

But this actually places the model TWICE AS FAR as it should be:

 

post-5799-0-51605500-1387507174.png

 

I decide to transform only child meshes, not parent meshes:

 

                BABYLON.SceneLoader.ImportMesh("", "house_A/", "house_A.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    //newMeshes[0].position = new BABYLON.Vector3(-431.1, 0, -29.5);
                    //newMeshes[0].rotation.y = Math.PI / 2;
                    for (j = 1; j < newMeshes.length; j++) {
                        if (newMeshes[j].subMeshes.length==0) {
                                newMeshes[j].position.x = -431.1;
                                newMeshes[j].position.y = 0;
                                newMeshes[j].position.z = -29.5;
                                newMeshes[j].rotation.y = Math.PI / 2;
                            }
                    }
                });
 

This Works!!!

 

post-5799-0-92317900-1387507470.png

 

A closeup:

 

post-5799-0-10934600-1387507641.png

 

So my question is: Is this really the proper way to move / rotate a complex mesh?  Is there an easier way?

 

The file was generated in Maya, so this will be a common "problem" for a lot of 3D modelers who use Maya.

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ProfessorF Newbie

ProfessorF

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Posted

Finally, this is how I did five House A's, using Clone on the *parent* meshes

 

                BABYLON.SceneLoader.ImportMesh("", "neighborhood_terrain/", "neighborhood_terrain.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    newMeshes[0].position = new BABYLON.Vector3(0, 0, 0);  
                });
                BABYLON.SceneLoader.ImportMesh("", "house_A/", "house_A.babylon", scene, function (newMeshes, particleSystems, skeletons) {
                    var housedata = [ // These are in Right-Hand Coordinates, So don't forget to convert
                        [-431.1,0, 29.5, -90],
                        [-44.1, 0, 191.7, 0],
                        [-304.1, 0, 122.3, 90],
                        [-255.7, 0, 209.4, 270],
                        [-416.2, 0, 268.8, 58.9]                        
                    ];
 
                    for (var i = 0; i < housedata.length; i++) {
                        harray = housedata;
                        if (i == 0) {
                            for (j = 1; j < newMeshes.length; j++) {                               
                                if (newMeshes[j].subMeshes.length == 0) { // don't Clone the original mesh, just position
                                    newMeshes[j].position.x = harray[0];
                                    newMeshes[j].position.y = harray[1];
                                    newMeshes[j].position.z = -harray[2]; // for R->L coordinate
                                    newMeshes[j].rotation.y = -harray[3]*Math.PI/180;
                                }
                            }
                        } else {
                            for (j = 1; j < newMeshes.length; j++) {
                                if (newMeshes[j].subMeshes.length != 0) { // can't dup child meshes, dup parents
                                    c = newMeshes[j].clone(); // name?
                                    c.position.x = harray[0];
                                    c.position.y = harray[1];
                                    c.position.z = -harray[2];
                                    c.rotation.y = -harray[3] * Math.PI / 180;
                                }
                            }
                        }
                    }
                });
 
post-5799-0-21665200-1387509524.png
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reddozen Newbie

reddozen

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Posted

I've had similar problems with my scenes. If you have any translations or rotations on your meshes before you export them from a 3D program, Babylon will assume that the in editor location is "0,0,0" so any additional translations after cloning will go from there.

 

Since I've been working on exporting my UV coordinates etc I haven't had time to revisit my own issues, but I've found it difficult to translate coordinates systems / scale from one format to Babylon.

 

Exactly what deltakosh is saying....

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ProfessorF Newbie

ProfessorF

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Alright!  Thanks for the tips DeltaKosh & RedDozen. The neighborhood loaded fine without any stray meshes this time:

 

post-5799-0-24087900-1387580583.png

 

The steps were:

 

1. Load mesh

2. Create array of x,y,z,rot

3. Call cloneModel function

 

               
 BABYLON.SceneLoader.ImportMesh("", "house_A/", "house_A.babylon", scene, function (newMeshes, particleSystems, skeletons) {  // STEP 1                    var housedata = [ // STEP 2 These are in Right-Hand Coordinates, So don't forget to convert                        [-431.1,0, 29.5, -90],                        [-44.1, 0, 191.7, 0],                        [-304.1, 0, 122.3, 90],                        [-255.7, 0, 209.4, 270],                        [-416.2, 0, 268.8, 58.9]                                            ];                    cloneModel(housedata, newMeshes); // STEP 3                });    function cloneModel(data, meshes) {        for (var i = 0; i < data.length; i++) {            var harray = data[i];            if (i == 0) {                for (var j = 1; j < meshes.length; j++) {  // JUST MOVE THE FIRST MODEL                    if (meshes[j].subMeshes.length != 0) { // MOVE PARENTS                        meshes[j].position.x = harray[0];                        meshes[j].position.y = harray[1];                        meshes[j].position.z = -harray[2]; // for R->L coordinate                        meshes[j].rotation.y = -harray[3] * Math.PI / 180;                    }                    else { // ZERO OUT CHILDREN per DeltaKosh                        meshes[j].position.x = 0;                        meshes[j].position.y = 0;                        meshes[j].position.z = 0;                         meshes[j].rotation.y = 0;                    }                }            } else {                for (var j = 1; j < meshes.length; j++) { // CLONE THE REST OF THE MODELS                    if (meshes[j].subMeshes.length != 0) { // can't dup child meshes, dup parents                        var c = meshes[j].clone(); // name?                        c.position.x = harray[0];                        c.position.y = harray[1];                        c.position.z = -harray[2];                        c.rotation.y = -harray[3] * Math.PI / 180;                    }                }            }        }    }
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