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fbx exporter: handle multi-meshes objects
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@LeoVgr
LeoVgr committed Jan 10, 2024
1 parent 50c4ae1 commit 5a4da58
Showing 1 changed file with 121 additions and 62 deletions.
183 changes: 121 additions & 62 deletions hxd/fmt/fbx/Writer.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -547,87 +547,146 @@ class Writer {
o.follow = obj.follow;
o.followPositionOnly = obj.followPositionOnly;
o.visible = obj.visible;
if( obj.defaultTransform != null )
o.defaultTransform = obj.defaultTransform.clone();
if( obj.defaultTransform != null ) {
if (o.defaultTransform != null)
o.defaultTransform = o.defaultTransform.multiplied(obj.defaultTransform.clone());
else
o.defaultTransform = obj.defaultTransform.clone();
}
return o;
}

function deepClone(m : h3d.scene.Mesh, ?parent : h3d.scene.Mesh) {
var copy = clone(m);

if (parent != null)
parent.addChild(copy);

for (child in @:privateAccess m.children) {
var childMesh = Std.downcast(child, h3d.scene.Mesh);

if (childMesh != null)
deepClone(childMesh, copy);
}

return copy;
}

function applyInverseDefaultTransform(obj : h3d.scene.Object, defaultTransform : h3d.Matrix) {
if (defaultTransform != null) {
var t = obj.getTransform().multiplied(defaultTransform.getInverse());
obj.x = t.getPosition().x;
obj.y = t.getPosition().y;
obj.z = t.getPosition().z;

var q : h3d.Quat = new h3d.Quat();
q.initRotation(t.getEulerAngles().x, t.getEulerAngles().y, t.getEulerAngles().z);
@:privateAccess obj.qRot.w = q.w;
@:privateAccess obj.qRot.x = q.x;
@:privateAccess obj.qRot.y = q.y;
@:privateAccess obj.qRot.z = q.z;

obj.scaleX = t.getScale().x;
obj.scaleY = t.getScale().y;
obj.scaleZ = t.getScale().z;
}
}

var roots : Array<h3d.scene.Mesh> = [];
function extractMeshes( o : h3d.scene.Object, ?parent : h3d.scene.Mesh) {
var m = Std.downcast(o, h3d.scene.Mesh);

// If this object isn't a mesh, we have to find into his children which mesh(s)
// is/are associated to it
if (m == null) {
for( c in @:privateAccess o.children ) {
var m2 = Std.downcast(c, h3d.scene.Mesh);
if (c.name == "root") {
if( m2 != null) {
var mesh = clone(m2);
var associatedMesh : h3d.scene.Object = null;

// Since it's the parent object that is holding informations
// apply it on mesh object
clone(o, mesh);
for (c in @:privateAccess o.children)
if (c.name == "root") // Associated mesh is named root (see makeInstance() of Model)
associatedMesh = c;

if (parent == null)
roots.push(mesh);

if (parent != null) {
parent.addChild(mesh);

if (parent.defaultTransform != null) {
var t = mesh.getTransform().multiplied(parent.defaultTransform.getInverse());
mesh.x = t.getPosition().x;
mesh.y = t.getPosition().y;
mesh.z = t.getPosition().z;

var q : h3d.Quat = new h3d.Quat();
q.initRotation(t.getEulerAngles().x, t.getEulerAngles().y, t.getEulerAngles().z);
@:privateAccess mesh.qRot.w = q.w;
@:privateAccess mesh.qRot.x = q.x;
@:privateAccess mesh.qRot.y = q.y;
@:privateAccess mesh.qRot.z = q.z;

mesh.scaleX = t.getScale().x;
mesh.scaleY = t.getScale().y;
mesh.scaleZ = t.getScale().z;
if (associatedMesh != null) {
var m2 = Std.downcast(associatedMesh, h3d.scene.Mesh);
var alreadyExtracted = new Array<h3d.scene.Object>();

if (m2 != null) {
// Single mesh object
var mesh = clone(m2);

// Since it's the parent object that is holding informations
// apply it on mesh object
clone(o, mesh);

if (parent == null)
roots.push(mesh);
else {
parent.addChild(mesh);
applyInverseDefaultTransform(mesh, parent.defaultTransform);
}

parent = cast mesh;
alreadyExtracted.push(m2);
}
else {
// Multiple mesh object
var randomRootMesh : h3d.scene.Mesh = null;
for (c in @:privateAccess associatedMesh.children) {
var mesh = Std.downcast(c, h3d.scene.Mesh);

if (mesh != null) {
var copy = deepClone(mesh);
clone(o, copy);

if (parent == null)
roots.push(copy);
else {
parent.addChild(copy);
applyInverseDefaultTransform(copy, parent.defaultTransform);
}
randomRootMesh = copy;
}

parent = cast mesh;
}

parent = randomRootMesh;
alreadyExtracted.push(associatedMesh);
}

// Continue to extract meshes on other objects
for (c in @:privateAccess o.children) {
if (alreadyExtracted.contains(c))
continue;

extractMeshes(c, parent);
}
}
}
else if (m.name != "root") {
var mesh = clone(m);
if (parent == null) {
roots.push(mesh);
parent = cast mesh;
}
else {
parent.addChild(mesh);

if (parent.defaultTransform != null) {
var t = mesh.getTransform().multiplied(parent.defaultTransform.getInverse());
mesh.x = t.getPosition().x;
mesh.y = t.getPosition().y;
mesh.z = t.getPosition().z;

var q : h3d.Quat = new h3d.Quat();
q.initRotation(t.getEulerAngles().x, t.getEulerAngles().y, t.getEulerAngles().z);
@:privateAccess mesh.qRot.w = q.w;
@:privateAccess mesh.qRot.x = q.x;
@:privateAccess mesh.qRot.y = q.y;
@:privateAccess mesh.qRot.z = q.z;

mesh.scaleX = t.getScale().x;
mesh.scaleY = t.getScale().y;
mesh.scaleZ = t.getScale().z;
// We're in the case where there is multiple meshes
// and no children
for (c in @:privateAccess o.children) {
var mesh = Std.downcast(c, h3d.scene.Mesh);

if (mesh != null) {
var copy = deepClone(mesh);
clone(o, copy);

if (parent == null)
roots.push(copy);
else {
parent.addChild(copy);
applyInverseDefaultTransform(copy, parent.defaultTransform);
}
}
}
}
}

for( c in @:privateAccess o.children ) {
extractMeshes(c, parent);
else {
var copy = clone(m);
if (parent == null)
roots.push(copy);
else {
parent.addChild(copy);
applyInverseDefaultTransform(copy, parent.defaultTransform);
}
}
}

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