/// <summary>
/// 为Renderer计算新的lightmapScaleOffset
/// </summary>
/// <param name="meshUVBounds">模型资源的原始UV包围盒</param>
/// <param name="uvBounds">定向到Lightmap上的一块用于指定Renderer的Lightmap纹理区间</param>
/// <returns></returns>
static Vector4d CalculateUVScaleOffset(Vector4d meshUVBounds, Vector4d uvBounds)
{
var scaleOffset = new Vector4d();
scaleOffset.x = (uvBounds.z - uvBounds.x) / (meshUVBounds.z - meshUVBounds.x);
scaleOffset.y = (uvBounds.w - uvBounds.y) / (meshUVBounds.w - meshUVBounds.y);
scaleOffset.z = uvBounds.z - meshUVBounds.z * scaleOffset.x;
scaleOffset.w = uvBounds.w - meshUVBounds.w * scaleOffset.y;
return(scaleOffset);
}
unsafe static void _RepackLightmap()
{
var gos = Selection.gameObjects;
var checkMSG = false;
REOPEN:
if (gos.Length == 0)
{
UDebug.LogError("Please select a GameObject in hierarchy to process!");
return;
}
var hierarchy = UnityUtils.GetHierarchyPath(gos[0].transform);
if (!checkMSG)
{
checkMSG = true;
if (!EditorUtility.DisplayDialog(Title, "请确认：处理的是原始场景，如果已经处理过，请重新加载场景。", "直接整", "好吧，重新加载场景"))
{
UnityEditor.SceneManagement.EditorSceneManager.OpenScene(currentScene);
gos = new GameObject[] { GameObject.Find(hierarchy) };
goto REOPEN;
}
}
// 经过测试，这个值确实是输出到了最终lightmap纹理中纹理单位的间隔
var Padding = LightmapEditorSettings.padding;
Bounds bounds;
var workingPath = CleanTempFolder();
var allRenderers = CollectAllLightmapedRenderers(gos, out bounds).Values.ToList();
// 把搜集到的原始Mesh重新保存成asset格式，便于后面的修改（FBX无法修改）
var meshes = new Dictionary <Mesh, Mesh>();
for (int i = 0; i < allRenderers.Count; ++i)
{
var ri = allRenderers[i];
var srcMesh = ri.mesh;
if (!srcMesh.isReadable)
{
UDebug.LogError("Mesh \"{0}\" is not readable!");
continue;
}
var mf = ri.renderer.transform.GetComponent <MeshFilter>();
if (mf == null)
{
continue;
}
Mesh dstMesh = null;
if (!meshes.TryGetValue(srcMesh, out dstMesh))
{
var assetPath = String.Format("{0}/{1}_{2}.mesh.asset", workingPath, srcMesh.name, meshes.Count);
if (File.Exists(assetPath))
{
AssetDatabase.DeleteAsset(assetPath);
}
AssetDatabase.CreateAsset(UnityEngine.Object.Instantiate <Mesh>(srcMesh), assetPath);
dstMesh = AssetDatabase.LoadAssetAtPath <Mesh>(assetPath);
meshes.Add(srcMesh, dstMesh);
}
//覆盖原始模型
mf.sharedMesh = dstMesh;
}
if (meshes.Count > 0)
{
var litmapData = LoadAllLightmapData();
if (litmapData == null)
{
UDebug.LogError("Load source lightmaps failed.");
return;
}
var inputRects = new List <NativeAPI.stbrp_rect>();
var all_atlas_pixels = new Dictionary <int, AtlasPixelsPage>();
var lightmapRectInfoList = new List <LightmapRect>();
using (var tp = new TexturePacker()) {
for (int i = 0; i < allRenderers.Count; ++i)
{
var ri = allRenderers[i];
var r = ri.renderer;
var uv2BoundsInfo = GetMeshUV2Bounds(r);
int lightmapIndex = uv2BoundsInfo.lightmapIndex;
if (lightmapIndex >= 0 && lightmapIndex < litmapData.Count)
{
var lightmapData = litmapData[r.lightmapIndex];
var meshUVBounds = uv2BoundsInfo.srcUVBounds;
var lightmapUVBounds = uv2BoundsInfo.lightmapUVBounds;
Real fMinX = lightmapUVBounds.x * lightmapData.width;
Real fMaxX = lightmapUVBounds.z * lightmapData.width;
Real fMinY = lightmapUVBounds.y * lightmapData.height;
Real fMaxY = lightmapUVBounds.w * lightmapData.height;
#if LIGHTMAPREPACKER_PRECISION_HIGH
int pixMinX = ( int )Math.Max(Math.Floor(lightmapUVBounds.x * lightmapData.width), 0);
int pixMaxX = ( int )Math.Min(Math.Ceiling(lightmapUVBounds.z * lightmapData.width), lightmapData.width);
int pixMinY = ( int )Math.Max(Math.Floor(lightmapUVBounds.y * lightmapData.height), 0);
int pixMaxY = ( int )Math.Min(Math.Ceiling(lightmapUVBounds.w * lightmapData.height), lightmapData.height);
#else
int pixMinX = ( int )Math.Max(Mathf.Floor(lightmapUVBounds.x * lightmapData.width), 0);
int pixMaxX = ( int )Math.Min(Mathf.Ceil(lightmapUVBounds.z * lightmapData.width), lightmapData.width);
int pixMinY = ( int )Math.Max(Mathf.Floor(lightmapUVBounds.y * lightmapData.height), 0);
int pixMaxY = ( int )Math.Min(Mathf.Ceil(lightmapUVBounds.w * lightmapData.height), lightmapData.height);
#endif
if (pixMaxX <= pixMinX || pixMaxY <= pixMinY)
{
UDebug.LogError("Invalid LightmapUV: {0}", UnityUtils.GetHierarchyPath(r.transform));
continue;
}
// 传入自己的TexturePacker之前，把border大小加上去
var rt = default(NativeAPI.stbrp_rect);
rt.w = ( ushort )((pixMaxX - pixMinX) + Padding);
rt.h = ( ushort )((pixMaxY - pixMinY) + Padding);
var lightmapRect = new LightmapRect();
lightmapRect.renderer = r;
lightmapRect.lightmapUVBounds = lightmapUVBounds;
lightmapRect.meshUVBounds = meshUVBounds;
lightmapRect.lightmapPixelBounds = new Vector4i(pixMinX, pixMinY, pixMaxX, pixMaxY);
lightmapRect.lightmapPixelFBounds = new Vector4d(fMinX, fMinY, fMaxX, fMaxY);
rt.id = lightmapRectInfoList.Count;
inputRects.Add(rt);
lightmapRectInfoList.Add(lightmapRect);
}
}
tp.PackRects(inputRects.ToArray());
tp.ForEach(
(page, atlasSize, rt) => {
var lightmapRect = lightmapRectInfoList[rt.id];
var renderer = lightmapRect.renderer;
var lightmapData = litmapData[renderer.lightmapIndex];
AtlasPixelsPage atlas_pixels;
if (!all_atlas_pixels.TryGetValue(page, out atlas_pixels))
{
atlas_pixels = new AtlasPixelsPage {
pixels = new Vector4[atlasSize * atlasSize],
size = atlasSize
};
all_atlas_pixels.Add(page, atlas_pixels);
}
// 原始像素包围盒，不包含Border
var i_minx = ( int )lightmapRect.lightmapPixelBounds.x;
var i_miny = ( int )lightmapRect.lightmapPixelBounds.y;
var i_maxx = ( int )lightmapRect.lightmapPixelBounds.z;
var i_maxy = ( int )lightmapRect.lightmapPixelBounds.w;
#if FIXING_LIGHTMAP_UVBORDER
int rtOffset = Padding / 2;
if (Padding > 0)
{
// 扩大边框，多拷贝一些边缘像素消除黑边
i_minx -= Padding / 2;
i_miny -= Padding / 2;
i_maxx += Padding - Padding / 2;
i_maxy += Padding - Padding / 2;
}
#else
int rtOffset = 0;
#endif
// lightmap像素块copy
fixed(Vector4 * _atlas_pixels = atlas_pixels.pixels)
{
for (int y = i_miny; y < i_maxy; y++)
{
int dy = y - i_miny + (rt.y - rtOffset);
if (dy < 0 || dy >= atlasSize)
{
continue;
}
// 纹理坐标需要翻转一下，像素是翻转了的
int _dy = atlasSize - 1 - dy;
int _sy = lightmapData.height - 1 - y;
int _dy_stride = _dy * atlasSize;
int _sy_stride = _sy * lightmapData.width;
for (int x = i_minx; x < i_maxx; x++)
{
int dx = x - i_minx + (rt.x - rtOffset);
if (dx < 0 || dx >= atlasSize)
{
continue;
}
_atlas_pixels[_dy_stride + dx] = lightmapData.GetPixelClamped(x, _sy);
}
}
}
var uvBounds = new Vector4d();
Real errorX = 0;
Real errorY = 0;
Real errorZ = 0;
Real errorW = 0;
#if FIXING_LIGHTMAP_UVERROR
errorX = lightmapRect.lightmapPixelFBounds.x - lightmapRect.lightmapPixelBounds.x;
errorY = lightmapRect.lightmapPixelFBounds.y - lightmapRect.lightmapPixelBounds.y;
errorZ = lightmapRect.lightmapPixelFBounds.z - lightmapRect.lightmapPixelBounds.z;
errorW = lightmapRect.lightmapPixelFBounds.w - lightmapRect.lightmapPixelBounds.w;
#endif
uvBounds.x = ((rt.x + errorX) / ( Real )atlasSize);
uvBounds.y = ((rt.y + errorY) / ( Real )atlasSize);
// 计算在新的lightmap纹理下的纹理坐标包围盒，由于pack之前我们人为加了一个Padding，所以这里计算要减去
uvBounds.z = (((rt.x + rt.w + errorZ) - Padding) / ( Real )atlasSize);
uvBounds.w = (((rt.y + rt.h + errorW) - Padding) / ( Real )atlasSize);
if (Mathf.Approximately(( float )lightmapRect.meshUVBounds.z, ( float )lightmapRect.meshUVBounds.x) ||
Mathf.Approximately(( float )lightmapRect.meshUVBounds.w, ( float )lightmapRect.meshUVBounds.y))
{
// 无效
renderer.lightmapIndex = -1;
renderer.lightmapScaleOffset = new Vector4(1, 1, 0, 0);
UDebug.LogError("Invalid LightmapUV's bounds: {0}", UnityUtils.GetHierarchyPath(lightmapRect.renderer.transform));
}
else
{
// 计算新的ScaleOffset，映射到新的lightmap纹理
renderer.lightmapIndex = page;
var sf = CalculateUVScaleOffset(lightmapRect.meshUVBounds, uvBounds);
renderer.lightmapScaleOffset = new Vector4(( float )sf.x, ( float )sf.y, ( float )sf.z, ( float )sf.w);
}
}
);
if (all_atlas_pixels.Count > 0)
{
var lightmapOutputPath = workingPath;
var lightmaps = new LightmapData[all_atlas_pixels.Count];
var lightmapPathList = new List <KeyValuePair <String, int> >(all_atlas_pixels.Count);
int pageIndex = 0;
foreach (var pagePixels in all_atlas_pixels)
{
fixed(Vector4 *_atlas_pixels = pagePixels.Value.pixels)
{
EditorUtility.DisplayProgressBar(Title, "Saving lightmap atlas...", ( float )pageIndex / ( float )all_atlas_pixels.Count);
pageIndex++;
int atlasSize = pagePixels.Value.size;
var path = String.Format("{0}/lightmap_{1}.exr", lightmapOutputPath, pagePixels.Key);
if (File.Exists(path))
{
AssetDatabase.DeleteAsset(path);
}
NativeAPI.SaveEXR(( IntPtr )_atlas_pixels, atlasSize, atlasSize, 4, 0, path);
lightmapPathList.Add(new KeyValuePair <String, int>(path, pagePixels.Key));
}
}
try {
AssetDatabase.Refresh();
pageIndex = 0;
for (int j = 0; j < lightmapPathList.Count; j++)
{
var path = lightmapPathList[j].Key;
var page = lightmapPathList[j].Value;
EditorUtility.DisplayProgressBar(Title, "Apply lightmap atlas...", ( float )pageIndex / ( float )all_atlas_pixels.Count);
pageIndex++;
var ti = AssetImporter.GetAtPath(path) as TextureImporter;
if (ti != null)
{
if (ti.textureType != TextureImporterType.Lightmap || ti.isReadable || ti.wrapMode != TextureWrapMode.Clamp)
{
ti.textureType = TextureImporterType.Lightmap;
ti.isReadable = false;
ti.wrapMode = TextureWrapMode.Clamp;
AssetDatabase.ImportAsset(ti.assetPath);
}
var tex = AssetDatabase.LoadAssetAtPath(path, typeof(Texture2D)) as Texture2D;
if (tex != null)
{
lightmaps[page] = new LightmapData();
lightmaps[page].lightmapColor = tex;
}
}
}
} finally {
LightmapSettings.lightmaps = lightmaps;
}
}
}
}
}