//todo -- this needs to fleshed out more once weapons work.
//probably dont want an object for each point. Probably want
//to add a gunslot component here to contain this data instead.
private GameObject CreateMissilePoints()
{
if (!model.HasMissileSlots)
{
return(null);
}
GameObject retn = new GameObject("Missile Points");
List <MissileSlot> missileSlots = model.missileSlots;
for (int i = 0; i < missileSlots.Count; i++)
{
MissileSlot slot = missileSlots[i];
for (int j = 0; j < slot.missilePoints.Length; j++)
{
GameObject go = new GameObject("Missile Point " + i + " -- " + j);
PositionNormal missilePoint = slot.missilePoints[j];
go.transform.parent = retn.transform;
go.transform.position = missilePoint.point;
if (missilePoint.normal == Vector3.zero)
{
missilePoint.normal = Vector3.forward;
}
go.transform.rotation = Quaternion.LookRotation(missilePoint.normal, Vector3.up);
}
}
return(retn);
}
//todo -- this needs to fleshed out more once weapons work.
//probably dont want an object for each point. Probably want
//to add a gunslot component here to contain this data instead.
private GameObject CreateGunPoints()
{
if (!model.HasGunSlots)
{
return(null);
}
GameObject retn = new GameObject("Gun Points");
List <GunSlot> gunSlots = model.gunSlots;
for (int i = 0; i < gunSlots.Count; i++)
{
GunSlot slot = gunSlots[i];
for (int j = 0; j < slot.gunPoints.Length; j++)
{
GameObject go = new GameObject("Gun Point " + i + " -- " + j);
PositionNormal gunPoint = slot.gunPoints[j];
go.transform.parent = retn.transform;
go.transform.position = gunPoint.point;
if (gunPoint.normal == Vector3.zero)
{
gunPoint.normal = Vector3.forward;
}
go.transform.rotation = Quaternion.LookRotation(gunPoint.normal, Vector3.up);
}
}
return(retn);
}
private void CalculateNormal(PositionNormal v1, PositionNormal v2, PositionNormal v3)
{
Vector3 vu = v3.Position - v1.Position;
Vector3 vt = v2.Position - v1.Position;
Vector3 normal = Vector3.Cross(vu, vt);
normal.Normalize();
v1.Normal += normal;
v2.Normal += normal;
v3.Normal += normal;
}
public void GetObjectPositionOnWater(ObjectGeometry obj, WaterShader shader)
{
PositionNormal p11 = new PositionNormal();
PositionNormal p12 = new PositionNormal();
PositionNormal p13 = new PositionNormal();
PositionNormal p21 = new PositionNormal();
PositionNormal p22 = new PositionNormal();
PositionNormal p23 = new PositionNormal();
PositionNormal p31 = new PositionNormal();
PositionNormal p32 = new PositionNormal();
PositionNormal p33 = new PositionNormal();
Vector3 position = obj.ModelMatrix.Translation;
position.Y = 20;
p11.Position = CalculatePosition(Vector3.Transform(position + new Vector3(-5, 0, 5), obj.RotationMatrix), shader);
p12.Position = CalculatePosition(Vector3.Transform(position + new Vector3(0, 0, 5), obj.RotationMatrix), shader);
p13.Position = CalculatePosition(Vector3.Transform(position + new Vector3(5, 0, 5), obj.RotationMatrix), shader);
p21.Position = CalculatePosition(Vector3.Transform(position + new Vector3(-5, 0, 0), obj.RotationMatrix), shader);
p22.Position = CalculatePosition(Vector3.Transform(position + new Vector3(0, 0, 0), obj.RotationMatrix), shader);
p23.Position = CalculatePosition(Vector3.Transform(position + new Vector3(5, 0, 0), obj.RotationMatrix), shader);
p31.Position = CalculatePosition(Vector3.Transform(position + new Vector3(-5, 0, -5), obj.RotationMatrix), shader);
p32.Position = CalculatePosition(Vector3.Transform(position + new Vector3(0, 0, -5), obj.RotationMatrix), shader);
p33.Position = CalculatePosition(Vector3.Transform(position + new Vector3(5, 0, -5), obj.RotationMatrix), shader);
CalculateNormal(p11, p22, p23);
CalculateNormal(p11, p12, p23);
CalculateNormal(p12, p22, p23);
CalculateNormal(p12, p13, p23);
CalculateNormal(p21, p31, p32);
CalculateNormal(p21, p22, p32);
CalculateNormal(p22, p32, p33);
CalculateNormal(p22, p23, p33);
obj.Translate(new Vector3(position.X,p22.Position.Y,position.Z));
obj.Update();
obj.UpVector = p22.Normal;
obj.RightVector = Vector3.Cross(obj.ForwardVector, obj.UpVector);
obj.RightVector = Vector3.Normalize(obj.RightVector);
obj.ForwardVector = Vector3.Cross(obj.UpVector, obj.RightVector);
obj.ForwardVector = Vector3.Normalize(obj.ForwardVector);
}
private PositionNormal[] CreatePointCloudData()
{
// Performance note for NVIDIA GTX 970 with 4 GB ram:
// 20 mio points: CompleteRenderTime takes around 10 ms
// 10 mio points: CompleteRenderTime is less than 0.1 ms
//
// On NVIDIA 1080 GTX with 8 GB ram the big performance drop happens around 40 mio points.
int overallPointCount = (int)PointsCountComboBox.SelectedItem;
//int overallPointCount = 100000;
int sliceCount = 500; // 500 points in one horizontal circle
if ((long)overallPointCount * (long)PositionNormal.SizeInBytes > (long)Int32.MaxValue)
{
throw new Exception("shadedPoints array too big. Split data into multiple arrays.");
}
var shadedPoints = new PositionNormal[overallPointCount];
//for (int i = 0; i < overallPointCount / sliceCount; i++)
// Parallel improves performance of 50 mio points from 4378ms to 821ms
Parallel.For(0, overallPointCount / sliceCount, (i) =>
{
for (int j = 0; j < sliceCount; j++)
{
int index = sliceCount * i + j;
float x = 30.0f * (float)Math.Cos(2 * Math.PI * (double)j / sliceCount);
float y = 0.02f * i;
float z = 30.0f * (float)Math.Sin(2 * Math.PI * (double)j / sliceCount);
var normal = new Vector3(x, 0, z);
normal.Normalize();
shadedPoints[index] = new PositionNormal()
{
Position = new Vector3(x, y, z),
Normal = normal
};
}
});
return(shadedPoints);
}
// Load position and normal data from a text file.
// The first line in the file must be number of points.
// Then each line represents one point with tab separated values (floats are in InvariantCulture with . as decimal separator).
private PositionNormal[] LoadPointCloudData(string fileName)
{
PositionNormal[] shadedPoints = null;
using (var fs = System.IO.File.OpenText(fileName))
{
int index = -1;
try
{
string oneLine = fs.ReadLine();
// First line should have number of rows
int rowsCount = Int32.Parse(oneLine);
index++;
shadedPoints = new PositionNormal[rowsCount];
for (int i = 0; i < rowsCount; i++)
{
oneLine = fs.ReadLine();
var oneLineParts = oneLine.Split('\t');
// IMPORTANT: In WPF and DXEngine y is up so we need to swap y and z values
shadedPoints[index].Position = new Vector3(float.Parse(oneLineParts[0], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(oneLineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(oneLineParts[1], System.Globalization.CultureInfo.InvariantCulture));
shadedPoints[index].Normal = new Vector3(float.Parse(oneLineParts[3], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(oneLineParts[5], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(oneLineParts[4], System.Globalization.CultureInfo.InvariantCulture));
index++;
}
}
catch (Exception ex)
{
MessageBox.Show(string.Format("Error reading point cloud data in line {0} of file:\r\n{1}\r\n\r\nError message:\r\n{2}",
index + 1, fileName, ex.Message));
return(shadedPoints);
}
}
return(shadedPoints);
}
private MeshBase CreateTubePathMesh(Vector3[] pathPositions, float radius, int segmentsCount, bool isTubeClosed, Color4 tubeColor)
{
int pathPositionsCount = pathPositions.Length;
// Preallocate the positions, indices, normals and textures collections - this prevents resizing the collection when the elements are added to them
int totalPositionsCount = segmentsCount * pathPositionsCount;
int shownSegmentsCount = pathPositionsCount - 1;
int totalTriangleIndicesCount = shownSegmentsCount * segmentsCount * 2 * 3; // 2 triangles for each segment * No. of shown segments * 3 indices per triangle
if (isTubeClosed)
{
totalTriangleIndicesCount += (segmentsCount - 2) * 2 * 3; // Add closing triangles (for triangle strip)
}
var vertexBuffer = new PositionNormal[totalPositionsCount];
var indexBuffer = new int[totalTriangleIndicesCount];
AddTubePathMesh(pathPositions, radius, segmentsCount, isTubeClosed, vertexBuffer, indexBuffer, vertexBufferStartIndex: 0, indexBufferStartIndex: 0);
var simpleMesh = new SimpleMesh <PositionNormal>(vertexBuffer,
indexBuffer,
inputLayoutType: InputLayoutType.Position | InputLayoutType.Normal);
// Quickly calculate mesh BoundingBox
// If this is not done here, then BoundingBox is calculated in SimpleMesh with checking all the tube path's positions.
// To prevent checking all the positions, we can simplify the calculation of bounding box with using
// all path positions and then extending this for radius into all directions.
// This will create slightly bigger bounding box but this is not a problem.
var positionsBoundingBox = BoundingBox.FromPoints(pathPositions);
simpleMesh.Bounds = new Bounds(new Vector3(positionsBoundingBox.Minimum.X - radius, positionsBoundingBox.Minimum.Y - radius, positionsBoundingBox.Minimum.Z - radius),
new Vector3(positionsBoundingBox.Maximum.X + radius, positionsBoundingBox.Maximum.Y + radius, positionsBoundingBox.Maximum.Z + radius));
_disposables.Add(simpleMesh);
return(simpleMesh);
}
private void AddTubePathMesh(Vector3[] pathPositions, float radius, int segmentsCount, bool isTubeClosed, PositionNormal[] vertexBuffer, int[] indexBuffer, int vertexBufferStartIndex, int indexBufferStartIndex)
{
if (_lastSegmentsCount != segmentsCount)
{
_sinuses = new float[segmentsCount];
_cosines = new float[segmentsCount];
double angle = 0;
double angleStep = 2 * Math.PI / segmentsCount;
for (int i = 0; i < segmentsCount; i++)
{
_sinuses[i] = (float)Math.Sin(angle) * radius;
_cosines[i] = (float)Math.Cos(angle) * radius;
angle += angleStep;
}
_lastSegmentsCount = segmentsCount;
}
int pathPositionsCount = pathPositions.Length;
int totalPositionsCount = segmentsCount * pathPositionsCount;
Vector3 pathPosition1 = pathPositions[0];
Vector3 pathPosition2 = pathPositions[1];
Vector3 lastDirection = new Vector3();
// Calculate the perpendicular vectors for the first segment
// First get the direction of the
Vector3 pathSegmentDirection = pathPositions[1] - pathPosition1;
pathSegmentDirection.Normalize();
// Now we calculate the vectors that are perpendicular (90 degrees) to the averageSegmentDirection
// For heightDirection = (0, 1, 0) the values are:
// p1 = (1, 0, 0) - right
// p2 = (0, 0, -1) - into the screen
Vector3 p1, p2; // two perpendicular vectors
GetPerpendicularVectors(pathSegmentDirection, out p1, out p2);
int vertexBufferIndex = vertexBufferStartIndex;
int indexBufferIndex = indexBufferStartIndex;
for (int i = 0; i < pathPositionsCount; i++)
{
// Get the used direction for segment - this is the average of directions of the previous and the next segment (except for first and last segment)
Vector3 averageSegmentDirection;
if (i == 0)
{
// first segment: use the direction of the first segment except when the path is closed - the we need to average the first and last segment
averageSegmentDirection = pathSegmentDirection;
}
else if (i == pathPositionsCount - 1)
{
averageSegmentDirection = lastDirection;
}
else
{
// inner segments: average the direction of the previous and the next segment
pathPosition2 = pathPositions[i + 1];
pathSegmentDirection = pathPosition2 - pathPosition1;
pathSegmentDirection.Normalize();
// The direction of the inter-section circle is the average direction of the previous and next segment
averageSegmentDirection = (lastDirection + pathSegmentDirection) * 0.5f;
}
// Calculate the new perpendicular vectors (p1 and p2)
// We should not use the MathUtils.GetPerpendicularVectors because this could lead to sudden "flip" of a vector
// Therefore we reuse the previous p1 and p2 vectors and use the new averageSegmentDirection to update the p1 and p2 values
p1 = Vector3.Cross(p2, averageSegmentDirection);
var p1LengthSquared = p1.X * p1.X + p1.Y * p1.Y + p1.Z * p1.Z;
if (p1LengthSquared > 1e-6)
{
p2 = Vector3.Cross(averageSegmentDirection, p1);
}
else if (p1LengthSquared <= 1e-6)
{
// This could happen for the following data:
//pathPositions = new Point3DCollection(new Point3D[]
//{
// new Point3D(0, 0, 0),
// new Point3D(10, 0, 0),
// new Point3D(10, 0, 10),
// new Point3D(-10, 0, 10)
//});
GetPerpendicularVectors(averageSegmentDirection, out p1, out p2);
}
p1.Normalize();
p2.Normalize();
for (int j = 0; j < segmentsCount; j++)
{
float sin = _sinuses[j];
float cos = _cosines[j];
float x = sin * p1.X - cos * p2.X;
float y = sin * p1.Y - cos * p2.Y;
float z = sin * p1.Z - cos * p2.Z;
var onePosition = new Vector3(pathPosition1.X + x, pathPosition1.Y + y, pathPosition1.Z + z);
var oneNormal = new Vector3(x, y, z);
oneNormal.Normalize();
vertexBuffer[vertexBufferIndex] = new PositionNormal(onePosition, oneNormal);
vertexBufferIndex++;
}
pathPosition1 = pathPosition2;
lastDirection = pathSegmentDirection;
}
if (isTubeClosed)
{
// Fill the start circle with simple triangle strip
for (int i = 1; i < segmentsCount - 1; i++)
{
indexBuffer[indexBufferIndex] = 0;
indexBuffer[indexBufferIndex + 1] = i + 1;
indexBuffer[indexBufferIndex + 2] = i;
indexBufferIndex += 3;
}
}
// Setup triangle indices
int startPos1 = 0; // Start position on the previous circle
int startPos2 = segmentsCount; // Start position on this circle
// Code for no texture coordinates
for (int i = 0; i < pathPositionsCount - 1; i++)
{
int pos1 = startPos1;
int pos2 = startPos2;
for (int j = 1; j < segmentsCount; j++)
{
indexBuffer[indexBufferIndex] = pos1;
indexBuffer[indexBufferIndex + 1] = pos1 + 1;
indexBuffer[indexBufferIndex + 2] = pos2;
indexBuffer[indexBufferIndex + 3] = pos1 + 1;
indexBuffer[indexBufferIndex + 4] = pos2 + 1;
indexBuffer[indexBufferIndex + 5] = pos2;
pos1++;
pos2++;
indexBufferIndex += 6;
}
// No texture coordinates
indexBuffer[indexBufferIndex] = pos1;
indexBuffer[indexBufferIndex + 1] = startPos1;
indexBuffer[indexBufferIndex + 2] = pos2;
indexBuffer[indexBufferIndex + 3] = pos2;
indexBuffer[indexBufferIndex + 4] = startPos1;
indexBuffer[indexBufferIndex + 5] = startPos2;
startPos1 += segmentsCount;
startPos2 += segmentsCount;
indexBufferIndex += 6;
}
if (isTubeClosed)
{
// Fill the end circle with simple triangle strip
int lastCircleIndex = totalPositionsCount - segmentsCount;
for (int i = 1; i < segmentsCount - 1; i++)
{
indexBuffer[indexBufferIndex] = lastCircleIndex;
indexBuffer[indexBufferIndex + 1] = lastCircleIndex + i;
indexBuffer[indexBufferIndex + 2] = lastCircleIndex + i + 1;
indexBufferIndex += 3;
}
}
}
private void CreateMorphedMesh()
{
if (_simpleMesh == null)
{
return;
}
var meshPositions = _meshGeometry3D.Positions;
var meshNormals = _meshGeometry3D.Normals;
var positionsCount = meshPositions.Count;
// First store original positions into _originalMesh
// This array will provide much faster access to morphed positions then if we would access the data from MeshGeometry3D object.
var originalMesh = new PositionNormal[positionsCount];
for (int i = 0; i < positionsCount; i++)
{
originalMesh[i].Position = meshPositions[i].ToVector3();
originalMesh[i].Normal = meshNormals[i].ToVector3();
}
_originalMesh = originalMesh;
// Now create a copy of the original MeshGeometry3D (this is needed because after adjusting positions we also need to re-calculate normals)
var morphedMeshGeometry3D = new MeshGeometry3D();
// Copy positions from original MeshGeometry3D - we also adjust the y position of all positions that are above the center of the mesh
double yOffset = _originalMeshSizeY;
double yMiddle = _meshGeometry3D.Bounds.Y + _originalMeshSizeY / 2.0f; // get mesh center y value
morphedMeshGeometry3D.Positions = null; // Disconnect positions before changing (to prevent change notifications from slowing things down)
for (int i = 0; i < positionsCount; i++)
{
var onePosition = meshPositions[i];
if (onePosition.Y > yMiddle)
{
onePosition.Y += yOffset;
}
meshPositions[i] = onePosition;
}
morphedMeshGeometry3D.Positions = meshPositions;
// Because we have changed the positions, this also changed the normal vectors.
// We need to calculate normals again
meshNormals = Ab3d.Utilities.MeshUtils.CalculateNormals(morphedMeshGeometry3D);
morphedMeshGeometry3D.Normals = meshNormals;
// After we have a morphed MeshGeometry, we can prepared an optimized list of positions and normals.
_morphedMesh = new PositionNormal[positionsCount];
for (int i = 0; i < positionsCount; i++)
{
_morphedMesh[i] = new PositionNormal(meshPositions[i].ToVector3(), meshNormals[i].ToVector3());
}
// We also need to store original and morphed bounding box (bounds)
_originalBoundingBox = _meshGeometry3D.Bounds.ToBoundingBox();
_morphedBoundingBox = new BoundingBox(_originalBoundingBox.Minimum,
new Vector3(_originalBoundingBox.Maximum.X, _originalBoundingBox.Maximum.Y + (float)yOffset, _originalBoundingBox.Maximum.Z));
}