// -------------------------------------------------------------------------------------------- //
// Lights
// -------------------------------------------------------------------------------------------- //
// Returns lights in "srgb-ish" color space.
// Note that light values may be > 1, which is not really kosher in sRGB
static void BuildLights(SceneStatePayload payload)
{
var lightPayload = payload.lights;
lightPayload.ambientColor = RenderSettings.ambientLight;
for (int i = 0; i < App.Scene.GetNumLights(); ++i)
{
var transform = App.Scene.GetLight(i).transform;
Light unityLight = transform.GetComponent <Light>();
Debug.Assert(unityLight != null);
Color lightColor = unityLight.color * unityLight.intensity;
lightColor.a = 1.0f; // No use for alpha with light color.
// because transform.name might not be unique
int uniquifyingId = payload.idGenerator.GetIdFromInstanceId(transform);
// Match the old gltf export logic for easier diffing
var transformNameNoSpaces = transform.name.Replace(" ", "_");
lightPayload.lights.Add(new ExportUtils.LightPayload
{
legacyUniqueName = $"{transformNameNoSpaces}_i{uniquifyingId}",
name = transformNameNoSpaces,
type = unityLight.type,
lightColor = lightColor,
xform = ExportUtils.ChangeBasis(transform, payload)
});
}
}
// widget.ReferenceImage must be != null
// Never returns null
// id is an instance id
static ImageQuadPayload BuildImageQuadPayload(
SceneStatePayload payload, ImageWidget widget, DynamicExportableMaterial material, int id)
{
string nodeName = $"image_{widget.GetExportName()}_{id}";
// The child has no T or R but has some non-uniform S that we need to preserve.
// I'm going to do this by baking it into the GeometryPool
GameObject widgetChild = widget.m_ImageQuad.gameObject;
Matrix4x4 xform = ExportUtils.ChangeBasis(widget.transform, payload);
Vector3 localScale = widgetChild.transform.localScale;
// localScale is a muddle of aspect ratio and overall size. We don't know which of x or y
// was modified to set the aspect ratio, so get the size from z.
if (localScale.z > 0)
{
float overallSize = localScale.z;
localScale /= overallSize;
xform = xform * Matrix4x4.Scale(Vector3.one * overallSize);
}
// Create pool and bake in the leftover non-uniform scale
GeometryPool pool = new GeometryPool();
pool.Layout = material.VertexLayout;
pool.Append(widgetChild.GetComponent <MeshFilter>().sharedMesh, fallbackColor: Color.white);
pool.ApplyTransform(
Matrix4x4.Scale(localScale), Matrix4x4.identity, 1f,
0, pool.NumVerts);
// Important: This transform should only be applied once, since the pools are shared, and
// cannot include any mesh-local transformations.
ExportUtils.ConvertUnitsAndChangeBasis(pool, payload);
if (payload.reverseWinding)
{
// Note: this triangle flip intentionally un-does the Unity FBX import flip.
ExportUtils.ReverseTriangleWinding(pool, 1, 2);
}
return(new ExportUtils.ImageQuadPayload(payload.groupIdMapping.GetId(widget.Group))
{
// because Count always increments, this is guaranteed unique even if two different images
// have the same export name
legacyUniqueName = $"refimage_i{payload.imageQuads.Count}",
// We could (but don't) share the same aspect-ratio'd-quad for all instances of a refimage.
// Since the mesh is unique to the node, it can have the same name as the node.
geometryName = nodeName,
nodeName = nodeName,
xform = xform,
geometry = pool,
exportableMaterial = material,
});
}
// -------------------------------------------------------------------------------------------- //
// Xform only, no mesh data
// -------------------------------------------------------------------------------------------- //
static void BuildEmptyXforms(SceneStatePayload payload, IEnumerable <MediaWidget> widgets)
{
foreach (var mediaWidget in widgets)
{
payload.referenceThings.Add(new ExportUtils.XformPayload(
payload.groupIdMapping.GetId(mediaWidget.Group))
{
name = mediaWidget.GetExportName(),
xform = ExportUtils.ChangeBasis(mediaWidget.transform, payload)
});
}
}
public void Serialize()
{
// Get transform in canvas space, and write to scene.
TrTransform xf_CS = Coords.AsCanvas[transform];
var basisMat = Matrix4x4.identity;
if (m_UnitsInMeters)
{
basisMat[0, 0] *= App.UNITS_TO_METERS;
basisMat[1, 1] *= App.UNITS_TO_METERS;
basisMat[2, 2] *= -1 * App.UNITS_TO_METERS;
}
m_UsdCamera.transform = ExportUtils.ChangeBasis(xf_CS.ToMatrix4x4(), basisMat, basisMat.inverse);
m_UsdCamera.fov = m_RecordingCamera.fieldOfView;
m_Scene.Write(m_xformName, m_UsdCamera);
}
// Unused and untested
#if false
/// Converts the existing payload to the new color space and vector basis.
/// Note that scale is never converted and only gamma -> linear is currently supported.
public static void ConvertPayload(ColorSpace newColorSpace,
Vector3[] newVectorBasis,
SceneStatePayload payload)
{
// We don't handle uninitialized color spaces or linear -> srgb conversions.
// This is just not currently part of the export logic, so it's not implemented here.
if (newColorSpace == ColorSpace.Uninitialized ||
payload.colorSpace == ColorSpace.Uninitialized ||
(payload.colorSpace == ColorSpace.Linear && newColorSpace == ColorSpace.Gamma))
{
throw new NotImplementedException();
}
if (newColorSpace != payload.colorSpace)
{
ExportUtils.ConvertToLinearColorspace(payload.env);
ExportUtils.ConvertToLinearColorspace(payload.lights);
foreach (var group in payload.groups)
{
ExportUtils.ConvertToLinearColorspace(group.brushMeshes);
}
ExportUtils.ConvertToLinearColorspace(payload.modelMeshes);
}
if (newVectorBasis[0] != payload.vectorBasis[0] ||
newVectorBasis[1] != payload.vectorBasis[1] ||
newVectorBasis[2] != payload.vectorBasis[2])
{
// Never apply a scale change when changing basis.
Matrix4x4 basis = ExportUtils.GetBasisMatrix(payload);
foreach (var group in payload.groups)
{
ExportUtils.ChangeBasis(group.brushMeshes, basis);
}
ExportUtils.ChangeBasis(payload.modelMeshes, basis);
ExportUtils.ChangeBasis(payload.referenceImages, basis);
ExportUtils.ChangeBasis(payload.referenceModels, basis);
}
payload.colorSpace = newColorSpace;
payload.vectorBasis = newVectorBasis;
}
/// Plays back a named transform onto the current transform from a usd path.
/// The transform can optionally be smoothed using exponential smoothing.
/// Smoothing will be clamped between 0 - 1.
public void StartPlayback(string sketchName = "/Sketch", string xformName = "/VideoCamera",
float smoothing = 0)
{
m_xformName = xformName;
m_Smoothing = Mathf.Clamp01(smoothing);
m_IsRecording = false;
// Older versions of Tilt Brush exported usda camera paths in decimeters. We now
// export in meters to match USD geometry export. Older versions also didn't export any sketch
// data so we check here for the presence of sketch data to decide how to treat the camera
// path units.
bool hasSketchRoot = m_Scene.Stage.GetPrimAtPath(new pxr.SdfPath(sketchName));
m_xformName = hasSketchRoot ? sketchName + xformName : xformName;
float scale = hasSketchRoot ? App.UNITS_TO_METERS : 1;
m_UnitsInMeters = hasSketchRoot;
m_Scene.Time = null;
m_UsdCameraInfo = new UsdCameraSample();
m_UsdCameraInfo.shutter = new USD.NET.Unity.CameraSample.Shutter();
m_Scene.Read(m_xformName, m_UsdCameraInfo);
m_UsdCamera = new UsdCameraXformSample();
m_Scene.Time = 0;
m_Scene.Read(m_xformName, m_UsdCamera);
var basisMat = AxisConvention.GetFromUnity(AxisConvention.kUsd)
* Matrix4x4.Scale(Vector3.one * scale);
m_UsdCamera.transform = ExportUtils.ChangeBasis(m_UsdCamera.transform, basisMat, basisMat.inverse);
TrTransform xf_WS = UsdXformToWorldSpaceXform(m_UsdCamera);
xf_WS.ToTransform(transform);
m_PlaybackCameras = FindObjectsOfType <Camera>();
}
public void Deserialize()
{
m_Scene.Read(m_xformName, m_UsdCamera);
var basisMat = Matrix4x4.identity;
if (m_UnitsInMeters)
{
basisMat[0, 0] *= App.METERS_TO_UNITS;
basisMat[1, 1] *= App.METERS_TO_UNITS;
basisMat[2, 2] *= -1 * App.METERS_TO_UNITS;
}
m_UsdCamera.transform = ExportUtils.ChangeBasis(m_UsdCamera.transform, basisMat, basisMat.inverse);
TrTransform xf_WS = UsdXformToWorldSpaceXform(m_UsdCamera);
TrTransform old_WS = TrTransform.FromTransform(transform);
TrTransform new_WS = TrTransform.Lerp(old_WS, xf_WS, 1 - m_Smoothing);
new_WS.scale = m_UsdCameraInfo.eyeScale != 0 ? m_UsdCameraInfo.eyeScale : 1;
new_WS.ToTransform(transform);
// Pre-M23.3, .usd files won't have fov defined, so this value will be negative.
if (m_UsdCamera.fov > 0)
{
// A bit brute force, but we're running through all cameras in the scene to make
// sure the preview shows the modified fov.
for (int i = 0; i < m_PlaybackCameras.Length; ++i)
{
if (m_PlaybackCameras[i].gameObject.activeInHierarchy &&
m_PlaybackCameras[i].isActiveAndEnabled)
{
m_PlaybackCameras[i].fieldOfView = m_UsdCamera.fov;
}
}
}
}
private static void BuildModelsAsModelMeshes(
SceneStatePayload payload, IEnumerable <ModelWidget> modelWidgets)
{
// This is a quadruple-nested loop that's triply flattened into a single IEnumerable.
// The structure of the data is is:
// 1. There are 1+ Models (which I'll call "prefab" because Model is a loaded term here)
// 2. Each "prefab" is used by 1+ ModelWidgets ("instance")
// 3. Each ModelWidget, and the "prefab", contains 1+ GameObjects (which has a single Mesh)
// 4. Each Mesh has 1+ unity submeshes (almost always exactly 1)
// These are converted to ModelMeshPayload
//
// The resulting ModelMeshPayloads are a mixture of data from all 4 levels, for example
// - ModelMeshPayload.model comes from level 1
// - ModelMeshPayload.modelId comes from level 2
// - ModelMeshPayload.xform comes from level 3
// - ModelMeshPayload.pool comes from level 4
//
// Orthogonal to this nesting, some data comes from the "prefab" and some from the "instance",
// since we don't want to have to convert a mesh into GeometryPool once per instance.
// So we iterate level 3 for the Model once, up front; then each ModelWidget level 3 is
// a parallel iteration with that Model's pre-computed iteration.
foreach (var group in modelWidgets.GroupBy(widget => widget.Model))
{
Model prefab = group.Key;
// Each element represents a GameObject in the "prefab"
List <PrefabGeometry[]> prefabObjs = GetPrefabGameObjs(payload, prefab).ToList();
foreach ((ModelWidget widget, int widgetIndex) in group.WithIndex())
{
Matrix4x4 widgetXform = ExportUtils.ChangeBasis(widget.transform, payload);
// Acts like our AsScene[], AsCanvas[] accessors
var AsWidget = new TransformExtensions.RelativeAccessor(widget.transform);
// Verify that it's okay to parallel-iterate over the prefab and instance gameObjs.
// It should be, unless one or the other has mucked with their m_MeshChildren.
MeshFilter[] instanceObjs = widget.GetMeshes();
if (prefabObjs.Count != instanceObjs.Length)
{
Debug.LogError($"Bad Model instance: {prefabObjs.Count} {instanceObjs.Length}");
// TODO: check order as well, somehow
continue;
}
// Parallel iterate, taking shared things (GeometryPool, material, name) from the
// "prefab" and xforms, unique ids, etc from the "instance".
for (int objIndex = 0; objIndex < prefabObjs.Count; ++objIndex)
{
PrefabGeometry[] prefabSubMeshes = prefabObjs[objIndex];
GameObject instanceObj = instanceObjs[objIndex].gameObject;
Matrix4x4 localXform = ExportUtils.ChangeBasis(AsWidget[instanceObj.transform], payload);
int objId = payload.idGenerator.GetIdFromInstanceId(instanceObj);
Matrix4x4 xform = ExportUtils.ChangeBasis(instanceObj.transform, payload);
foreach (PrefabGeometry prefabSubMesh in prefabSubMeshes)
{
payload.modelMeshes.Add(new ExportUtils.ModelMeshPayload(
payload.groupIdMapping.GetId(widget.Group))
{
// Copied from "prefab"
model = prefabSubMesh.model,
geometry = prefabSubMesh.pool,
exportableMaterial = prefabSubMesh.exportableMaterial,
geometryName = prefabSubMesh.name,
// Unique to instance
legacyUniqueName = $"{prefabSubMesh.name}_i{objId}",
nodeName = $"{prefabSubMesh.name}_{widgetIndex}",
parentXform = widgetXform,
localXform = localXform,
modelId = widgetIndex,
xform = xform,
});
}
}
}
}
}