/// <summary>
/// Fills the given geometry using information from the given AC-File-Objects.
/// </summary>
/// <param name="objInfo">The object information from the AC file.</param>
/// <param name="acMaterials">A list containing all materials from the AC file.</param>
/// <param name="geometry">The Geometry to be filled.</param>
/// <param name="transformStack">Current matrix stack (for stacked objects).</param>
private static void FillGeometry(Geometry geometry, List <ACMaterialInfo> acMaterials, ACObjectInfo objInfo, Matrix4Stack transformStack)
{
var standardShadedVertices = new List <Tuple <int, int> >();
transformStack.Push();
try
{
// Perform local transformation for the current AC object
transformStack.TransformLocal(objInfo.Rotation);
transformStack.TranslateLocal(objInfo.Translation);
// Build geometry material by material
for (var actMaterialIndex = 0; actMaterialIndex < acMaterials.Count; actMaterialIndex++)
{
var actGeometrySurface = geometry.Surfaces[actMaterialIndex];
// Initialize local index table (needed for vertex reuse)
var oneSideVertexCount = objInfo.Vertices.Count;
var localIndices = new int[oneSideVertexCount * 2];
for (var loop = 0; loop < localIndices.Length; loop++)
{
localIndices[loop] = int.MaxValue;
}
// Process all surfaces
foreach (var actSurface in objInfo.Surfaces)
{
// Get the vertex index on which to start
var startVertexIndex = geometry.CountVertices;
var startTriangleIndex = actGeometrySurface.CountTriangles;
// Only handle surfaces of the current material
if (actSurface.Material != actMaterialIndex)
{
continue;
}
// Sort out unsupported surfaces
if (actSurface.VertexReferences.Count < 3)
{
continue;
}
if (actSurface.IsLine)
{
continue;
}
if (actSurface.IsClosedLine)
{
continue;
}
// Preprocess referenced vertices
var oneSideSurfaceVertexCount = actSurface.VertexReferences.Count;
var countSurfaceSides = actSurface.IsTwoSided ? 2 : 1;
var onGeometryReferencedVertices = new int[oneSideSurfaceVertexCount * countSurfaceSides];
var surfaceVertexReferences = actSurface.VertexReferences;
for (var loop = 0; loop < surfaceVertexReferences.Count; loop++)
{
var actTexCoord = actSurface.TextureCoordinates[loop];
if (!actSurface.IsFlatShaded)
{
// Try to reuse vertices on standard shading
if (localIndices[surfaceVertexReferences[loop]] == int.MaxValue)
{
var position = Vector3.Transform(
objInfo.Vertices[surfaceVertexReferences[loop]].Position,
transformStack.Top);
localIndices[surfaceVertexReferences[loop]] = geometry.AddVertex(new VertexBasic(
position, Color4.White, actTexCoord, Vector3.Zero));
if (actSurface.IsTwoSided)
{
localIndices[surfaceVertexReferences[loop] + oneSideVertexCount] = geometry.AddVertex(new VertexBasic(
position, Color4.White, actTexCoord, Vector3.Zero));
}
}
// Store vertex reference for this surface's index
onGeometryReferencedVertices[loop] = localIndices[surfaceVertexReferences[loop]];
if (actSurface.IsTwoSided)
{
onGeometryReferencedVertices[loop + oneSideSurfaceVertexCount] =
localIndices[surfaceVertexReferences[loop] + oneSideVertexCount];
}
}
else
{
// Create one vertex for one reference for flat shading
var position = Vector3.Transform(
objInfo.Vertices[surfaceVertexReferences[loop]].Position,
transformStack.Top);
onGeometryReferencedVertices[loop] = geometry.AddVertex(new VertexBasic(
position, Color4.White, actTexCoord, Vector3.Zero));
if (actSurface.IsTwoSided)
{
onGeometryReferencedVertices[loop + oneSideSurfaceVertexCount] = geometry.AddVertex(new VertexBasic(
position, Color4.White, actTexCoord, Vector3.Zero));
}
}
}
// Build object geometry
switch (actSurface.VertexReferences.Count)
{
case 3:
// Front side
actGeometrySurface.AddTriangle(
onGeometryReferencedVertices[0],
onGeometryReferencedVertices[1],
onGeometryReferencedVertices[2]);
// Back side
if (actSurface.IsTwoSided)
{
actGeometrySurface.AddTriangle(
onGeometryReferencedVertices[5],
onGeometryReferencedVertices[4],
onGeometryReferencedVertices[3]);
}
break;
case 4:
// Front side
actGeometrySurface.AddTriangle(
onGeometryReferencedVertices[0],
onGeometryReferencedVertices[1],
onGeometryReferencedVertices[2]);
actGeometrySurface.AddTriangle(
onGeometryReferencedVertices[2],
onGeometryReferencedVertices[3],
onGeometryReferencedVertices[0]);
// Back side
if (actSurface.IsTwoSided)
{
actGeometrySurface.AddTriangle(
onGeometryReferencedVertices[6],
onGeometryReferencedVertices[5],
onGeometryReferencedVertices[4]);
actGeometrySurface.AddTriangle(
onGeometryReferencedVertices[4],
onGeometryReferencedVertices[7],
onGeometryReferencedVertices[6]);
}
break;
default:
if (!actSurface.IsTwoSided)
{
// Front side
actGeometrySurface.AddPolygonByCuttingEars(onGeometryReferencedVertices);
}
else
{
// Front and back side
actGeometrySurface.AddPolygonByCuttingEars(onGeometryReferencedVertices.Subset(0, oneSideSurfaceVertexCount));
actGeometrySurface.AddPolygonByCuttingEars(onGeometryReferencedVertices.Subset(oneSideSurfaceVertexCount, oneSideSurfaceVertexCount));
}
break;
}
// Perform shading
if (actSurface.IsFlatShaded)
{
actGeometrySurface.CalculateNormalsFlat(
startTriangleIndex, actGeometrySurface.CountTriangles - startTriangleIndex);
}
else
{
// Nothing to be done for now..
var vertexCount = geometry.CountVertices - startVertexIndex;
if (vertexCount > 0)
{
standardShadedVertices.Add(
Tuple.Create(startVertexIndex, vertexCount));
}
}
}
// Calculate default shading finally (if any)
foreach (var actStandardShadedPair in standardShadedVertices)
{
geometry.CalculateNormals(
actStandardShadedPair.Item1,
actStandardShadedPair.Item2);
}
standardShadedVertices.Clear();
}
// Fill in all child object data
foreach (var actObjInfo in objInfo.Children)
{
FillGeometry(geometry, acMaterials, actObjInfo, transformStack);
}
}
finally
{
transformStack.Pop();
}
}
/// <summary>
/// Loads a ac file from the given uri
/// </summary>
internal static ACFileInfo LoadFile(Stream inStream)
{
ACFileInfo? result = null;
StreamReader?reader = null;
try
{
reader = new StreamReader(inStream);
//Check for correct header
var header = reader.ReadLine();
if (header == null ||
!header.StartsWith("AC3D"))
{
throw new SeeingSharpGraphicsException("Header of AC3D file not found!");
}
//Create file information object
result = new ACFileInfo();
//Create a loaded objects stack
var loadedObjects = new Stack <ACObjectInfo>();
var parentObjects = new Stack <ACObjectInfo>();
ACSurface?currentSurface = null;
//Read the file
while (!reader.EndOfStream)
{
var actLine = reader.ReadLine() !.Trim();
var firstWord = string.Empty;
var spaceIndex = actLine.IndexOf(' ');
if (spaceIndex == -1)
{
firstWord = actLine;
}
else
{
firstWord = firstWord = actLine.Substring(0, spaceIndex);
}
switch (firstWord)
{
//New Material info
case "MATERIAL":
var materialInfo = new ACMaterialInfo();
{
//Get the name of the material
var materialData = actLine.Split(' ');
if (materialData.Length > 1)
{
materialInfo.Name = materialData[1].Trim(' ', '"');
}
//Parse components
for (var loop = 0; loop < materialData.Length; loop++)
{
switch (materialData[loop])
{
case "rgb":
var diffuseColor = materialInfo.Diffuse;
diffuseColor.Alpha = 1f;
diffuseColor.Red = float.Parse(materialData[loop + 1], CultureInfo.InvariantCulture);
diffuseColor.Green = float.Parse(materialData[loop + 2], CultureInfo.InvariantCulture);
diffuseColor.Blue = float.Parse(materialData[loop + 3], CultureInfo.InvariantCulture);
materialInfo.Diffuse = diffuseColor;
break;
case "amb":
var ambientColor = new Color4();
ambientColor.Red = float.Parse(materialData[loop + 1], CultureInfo.InvariantCulture);
ambientColor.Green = float.Parse(materialData[loop + 2], CultureInfo.InvariantCulture);
ambientColor.Blue = float.Parse(materialData[loop + 3], CultureInfo.InvariantCulture);
materialInfo.Ambient = ambientColor;
break;
case "emis":
var emissiveColor = new Color4();
emissiveColor.Red = float.Parse(materialData[loop + 1], CultureInfo.InvariantCulture);
emissiveColor.Green = float.Parse(materialData[loop + 2], CultureInfo.InvariantCulture);
emissiveColor.Blue = float.Parse(materialData[loop + 3], CultureInfo.InvariantCulture);
materialInfo.Emissive = emissiveColor;
break;
case "spec":
var specularColor = new Color4();
specularColor.Red = float.Parse(materialData[loop + 1], CultureInfo.InvariantCulture);
specularColor.Green = float.Parse(materialData[loop + 2], CultureInfo.InvariantCulture);
specularColor.Blue = float.Parse(materialData[loop + 3], CultureInfo.InvariantCulture);
materialInfo.Specular = specularColor;
break;
case "shi":
materialInfo.Shininess = float.Parse(materialData[loop + 1], CultureInfo.InvariantCulture);
break;
case "trans":
diffuseColor = materialInfo.Diffuse;
diffuseColor.Alpha = 1f - EngineMath.Clamp(float.Parse(materialData[loop + 1], CultureInfo.InvariantCulture), 0f, 1f);
materialInfo.Diffuse = diffuseColor;
break;
}
}
result.Materials.Add(materialInfo);
}
break;
//New object starts here
case "OBJECT":
{
var newObject = new ACObjectInfo();
var lineData = actLine.Split(' ');
if (lineData[1] == "poly")
{
newObject.Type = ACObjectType.Poly;
}
else if (lineData[1] == "group")
{
newObject.Type = ACObjectType.Group;
}
else if (lineData[1] == "world")
{
newObject.Type = ACObjectType.World;
}
loadedObjects.Push(newObject);
}
break;
//End of an object, kids following
case "kids":
if (loadedObjects.Count == 0)
{
break;
}
{
//Parse kid count
var kidCount = 0;
var lineData = actLine.Split(' ');
if (lineData.Length >= 1)
{
int.TryParse(lineData[1], out kidCount);
}
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
//AddObject object to parent object, if any related
var addedToParent = false;
if (parentObjects.Count > 0)
{
var currentParent = parentObjects.Peek();
if (currentParent.Children.Count < currentParent.KidCount)
{
currentParent.Children.Add(currentObject);
addedToParent = true;
}
else
{
while (parentObjects.Count > 0)
{
parentObjects.Pop();
if (parentObjects.Count == 0)
{
break;
}
currentParent = parentObjects.Peek();
if (currentParent == null)
{
break;
}
if (currentParent.Children.Count < currentParent.KidCount)
{
break;
}
}
if (currentParent != null &&
currentParent.Children.Count < currentParent.KidCount)
{
currentParent.Children.Add(currentObject);
addedToParent = true;
}
}
}
//Enable this object as parent object
currentObject.KidCount = kidCount;
if (currentObject.KidCount > 0)
{
parentObjects.Push(currentObject);
}
//AddObject to scene root if this object has no parent
loadedObjects.Pop();
if (!addedToParent)
{
if (loadedObjects.Count == 0)
{
result.Objects.Add(currentObject);
}
else
{
loadedObjects.Peek().Children.Add(currentObject);
}
}
currentObject = null;
}
}
break;
//Current object's name
case "name":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
currentObject.Name = actLine.Replace("name ", "").Replace("\"", "");
}
}
break;
case "data":
break;
case "texture":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
currentObject.Texture = lineData[1].Trim('"');
}
}
break;
case "texrep":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
var repetition = new Vector2
{
X = float.Parse(lineData[1], CultureInfo.InvariantCulture),
Y = float.Parse(lineData[2], CultureInfo.InvariantCulture)
};
currentObject.TextureRepeat = repetition;
}
}
break;
case "texoff":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
var offset = new Vector2
{
X = float.Parse(lineData[1], CultureInfo.InvariantCulture),
Y = float.Parse(lineData[2], CultureInfo.InvariantCulture)
};
currentObject.TextureRepeat = offset;
}
}
break;
case "rot":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
var rotation = Matrix4x4.Identity;
rotation.M11 = !string.IsNullOrEmpty(lineData[1]) ? float.Parse(lineData[1], CultureInfo.InvariantCulture) : 0f;
rotation.M12 = !string.IsNullOrEmpty(lineData[2]) ? float.Parse(lineData[2], CultureInfo.InvariantCulture) : 0f;
rotation.M13 = !string.IsNullOrEmpty(lineData[3]) ? float.Parse(lineData[3], CultureInfo.InvariantCulture) : 0f;
rotation.M21 = !string.IsNullOrEmpty(lineData[4]) ? float.Parse(lineData[4], CultureInfo.InvariantCulture) : 0f;
rotation.M22 = !string.IsNullOrEmpty(lineData[5]) ? float.Parse(lineData[5], CultureInfo.InvariantCulture) : 0f;
rotation.M23 = !string.IsNullOrEmpty(lineData[6]) ? float.Parse(lineData[6], CultureInfo.InvariantCulture) : 0f;
rotation.M31 = !string.IsNullOrEmpty(lineData[7]) ? float.Parse(lineData[7], CultureInfo.InvariantCulture) : 0f;
rotation.M32 = !string.IsNullOrEmpty(lineData[8]) ? float.Parse(lineData[8], CultureInfo.InvariantCulture) : 0f;
rotation.M33 = !string.IsNullOrEmpty(lineData[9]) ? float.Parse(lineData[9], CultureInfo.InvariantCulture) : 0f;
currentObject.Rotation = rotation;
}
}
break;
case "url":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
currentObject.Url = lineData[1].Trim('"');
}
}
break;
//Current object's location
case "loc":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
var location = new Vector3
{
X = float.Parse(lineData[1], CultureInfo.InvariantCulture),
Y = float.Parse(lineData[2], CultureInfo.InvariantCulture),
Z = float.Parse(lineData[3], CultureInfo.InvariantCulture)
};
currentObject.Translation = location;
}
}
break;
case "numvert":
if (loadedObjects.Count == 0)
{
break;
}
{
var currentObject = loadedObjects.Peek();
if (currentObject != null)
{
var lineData = actLine.Split(' ');
var numberOfVertices = int.Parse(lineData[1], CultureInfo.InvariantCulture);
for (var loop = 0; loop < numberOfVertices; loop++)
{
var actInnerLine = reader.ReadLine() !.Trim();
var splittedVertex = actInnerLine.Split(' ');
var position = new Vector3
{
X = float.Parse(splittedVertex[0], CultureInfo.InvariantCulture),
Y = float.Parse(splittedVertex[1], CultureInfo.InvariantCulture),
Z = float.Parse(splittedVertex[2], CultureInfo.InvariantCulture)
};
currentObject.Vertices.Add(new ACVertex {
Position = position
});
}
}
}
break;
//Start of a list of surfaces
case "numsurf":
break;
//New surface starts here
case "SURF":
{
if (currentSurface == null)
{
currentSurface = new ACSurface();
}
var lineData = actLine.Split(' ');
lineData[1] = lineData[1].Substring(2);
currentSurface.Flags = int.Parse(lineData[1], NumberStyles.HexNumber);
}
break;
//Current surface's material
case "mat":
{
if (currentSurface == null)
{
currentSurface = new ACSurface();
}
var lineData = actLine.Split(' ');
currentSurface.Material = int.Parse(lineData[1], CultureInfo.InvariantCulture);
}
break;
//Current surface's indices
case "refs":
if (loadedObjects.Count == 0)
{
break;
}
{
if (currentSurface == null)
{
currentSurface = new ACSurface();
}
var lineData = actLine.Split(' ');
var numberOfRefs = int.Parse(lineData[1], CultureInfo.InvariantCulture);
for (var loop = 0; loop < numberOfRefs; loop++)
{
var actInnerLine = reader.ReadLine() !.Trim();
var splittedRef = actInnerLine.Split(' ');
var texCoord = new Vector2();
int vertexReference = ushort.Parse(splittedRef[0], CultureInfo.InvariantCulture);
texCoord.X = float.Parse(splittedRef[1], CultureInfo.InvariantCulture);
texCoord.Y = float.Parse(splittedRef[2], CultureInfo.InvariantCulture);
currentSurface.TextureCoordinates.Add(texCoord);
currentSurface.VertexReferences.Add(vertexReference);
}
var currentObject = loadedObjects.Peek();
currentObject?.Surfaces.Add(currentSurface);
currentSurface = null;
}
break;
}
}
}
finally
{
SeeingSharpUtil.SafeDispose(ref reader);
}
return(result);
}