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Fix 3: Apply hierarchical transforms to models

This commit is contained in:
Jarrod Doyle 2024-12-23 12:44:37 +00:00
parent 8191d30b20
commit db01667fb2
Signed by: Jayrude
GPG Key ID: 38B57B16E7C0ADF7
1 changed files with 49 additions and 14 deletions
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59
KeepersCompound.Lightmapper/MeshBuilder.cs
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@ -127,7 +127,7 @@ public class MeshBuilder
var model = new ModelFile(modelPath);
pos -= model.Header.Center;
// Calculate base model transform
var scalePart = Matrix4x4.CreateScale(scale);
var rotPart = Matrix4x4.Identity;
rotPart *= Matrix4x4.CreateRotationX(float.DegreesToRadians(rot.X));
@ -136,27 +136,62 @@ public class MeshBuilder
var transPart = Matrix4x4.CreateTranslation(pos);
var modelTrans = scalePart * rotPart * transPart;
// for each object modify the vertices
// TODO: Handle nested sub objects
foreach (var subObj in model.Objects)
// Calculate base transforms for every subobj (including joint)
var objCount = model.Objects.Length;
var subObjTransforms = new Matrix4x4[objCount];
for (var i = 0; i < objCount; i++)
{
var jointTrans = Matrix4x4.Identity;
var subObj = model.Objects[i];
var objTrans = Matrix4x4.Identity;
if (subObj.Joint != -1)
{
var ang = float.DegreesToRadians(joints[subObj.Joint]);
var ang = float.DegreesToRadians(joints[subObj.Joint]);
// TODO: Is this correct? Should I use a manual rotation matrix?
var jointRot = Matrix4x4.CreateFromYawPitchRoll(0, ang, 0);
var objTrans = subObj.Transform;
jointTrans = jointRot * objTrans;
objTrans = jointRot * subObj.Transform;
}
var transform = jointTrans * modelTrans;
subObjTransforms[i] = objTrans;
}
// Build map of objects to their parent id
var parentIds = new int[objCount];
for (var i = 0; i < objCount; i++)
{
parentIds[i] = -1;
}
for (var i = 0; i < objCount; i++)
{
var subObj = model.Objects[i];
var childIdx = subObj.Child;
while (childIdx != -1)
{
parentIds[childIdx] = i;
childIdx = model.Objects[childIdx].Next;
}
}
// Apply sub object transforms + the base object transform to each vertex
for (var i = 0; i < objCount; i++)
{
var subObj = model.Objects[i];
var transform = subObjTransforms[i];
var parentId = parentIds[i];
while (parentId != -1)
{
transform *= subObjTransforms[parentId];
parentId = parentIds[parentId];
}
transform *= modelTrans;
var start = subObj.PointIdx;
var end = start + subObj.PointCount;
for (var i = start; i < end; i++)
for (var j = start; j < end; j++)
{
var v = model.Vertices[i];
model.Vertices[i] = Vector3.Transform(v, transform);
var v = model.Vertices[j];
model.Vertices[j] = Vector3.Transform(v, transform);
}
}