/// <summary>
/// Calculate texture coordinates with face texturemapping values
/// </summary>
/// <param name="face"></param>
/// <param name="minimiseShiftValues"></param>
public void CalculateTextureCoordinatesForFace(SolidFace face, bool minimiseShiftValues = false)
{
if (face.TextureMapping.TextureLocked)
{
return;
}
TextureMapping mapping = face.TextureMapping;
foreach (SolidIndex vertexIndex in face.Indices)
{
Vector3 position = VertexPositions[vertexIndex.Index];
double u = (Vector3.Dot(position, mapping.UAxis) / mapping.UScale - mapping.UShift) /
face.Texture.Width;
double v = (Vector3.Dot(position, mapping.VAxis) / mapping.VScale + mapping.VShift) /
face.Texture.Height;
vertexIndex.DiffuseUv = new Vector2((float)u, (float)v);
}
if (minimiseShiftValues)
{
MinimiseTextureShiftValuesForFace(face);
}
}
/// <summary>
/// Align texture to extends for a given face
/// </summary>
/// <param name="extends"></param>
/// <param name="face"></param>
/// <param name="justifyType"></param>
public void AlignTextureToExtendsForFace(AABB extends, SolidFace face,
TextureProperties.JustifyType justifyType)
{
if (face.TextureMapping.TextureLocked)
{
return;
}
// get projected min/max
float projMinU = Vector3.Dot(extends.Min, face.TextureMapping.UAxis) / face.TextureMapping.UScale;
float projMinV = Vector3.Dot(extends.Min, face.TextureMapping.VAxis) / face.TextureMapping.VScale;
float projMaxU = Vector3.Dot(extends.Max, face.TextureMapping.UAxis) / face.TextureMapping.UScale;
float projMaxV = Vector3.Dot(extends.Max, face.TextureMapping.VAxis) / face.TextureMapping.VScale;
// check if V axis is 90 degrees lockwise of U axis
if (face.TextureMapping.VAxis.SignedAngleTo(face.TextureMapping.UAxis, face.Normal) < 0)
{
float temp = projMinU;
projMinU = projMaxU;
projMaxU = temp;
}
switch (justifyType)
{
case TextureProperties.JustifyType.Top:
face.TextureMapping.VShift = -projMaxV + face.Texture.Height;
break;
case TextureProperties.JustifyType.Bottom:
face.TextureMapping.VShift = -projMinV;
break;
case TextureProperties.JustifyType.Left:
face.TextureMapping.UShift = -projMinU;
break;
case TextureProperties.JustifyType.Right:
face.TextureMapping.UShift = -projMaxU + face.Texture.Width;
break;
case TextureProperties.JustifyType.Center:
float deltaU = (projMinU + projMaxU) / 2;
float deltaV = (projMinV + projMaxV) / 2;
face.TextureMapping.UShift = -deltaU + face.Texture.Width / 2f;
face.TextureMapping.VShift = -deltaV + face.Texture.Height / 2f;
break;
}
}
/// <summary>
/// Rotates the texture
/// </summary>
/// <param name="face"></param>
/// <param name="rotate">Absolute Angle in degrees</param>
public void SetTextureRotationForFace(SolidFace face, float rotate)
{
if (face.TextureMapping.TextureLocked)
{
return;
}
AlignTextureAxisToWorldForFace(face);
face.TextureMapping.Rotation = rotate;
Vector3 textureNormal = Vector3.Cross(face.TextureMapping.VAxis, face.TextureMapping.UAxis);
Matrix3 rotationMatrix = Matrix3.CreateFromAxisAngle(textureNormal, MathHelper.DegreesToRadians(-rotate));
face.TextureMapping.UAxis = face.TextureMapping.UAxis * rotationMatrix;
face.TextureMapping.VAxis = face.TextureMapping.VAxis * rotationMatrix;
}
private void MinimiseTextureShiftValuesForFace(SolidFace face)
{
face.TextureMapping.UShift = face.TextureMapping.UShift % face.Texture.Width;
face.TextureMapping.VShift = face.TextureMapping.VShift % face.Texture.Height;
if (face.TextureMapping.UShift < -face.Texture.Width / 2f)
{
face.TextureMapping.UShift += face.Texture.Width;
}
if (face.TextureMapping.VShift < -face.Texture.Height / 2f)
{
face.TextureMapping.VShift += face.Texture.Height;
}
}
/// <summary>
/// Fits texture to extends for a given face
/// </summary>
/// <param name="extends"></param>
/// <param name="face"></param>
public void FitTextureToExtendsForFace(AABB extends, SolidFace face)
{
if (face.TextureMapping.TextureLocked)
{
return;
}
// get projected min/max
float projMinU = Vector3.Dot(extends.Min, face.TextureMapping.UAxis);
float projMinV = Vector3.Dot(extends.Min, face.TextureMapping.VAxis);
float projMaxU = Vector3.Dot(extends.Max, face.TextureMapping.UAxis);
float projMaxV = Vector3.Dot(extends.Max, face.TextureMapping.VAxis);
// calculate new texture mapping properties
face.TextureMapping.UScale = Math.Abs((projMaxU - projMinU) / face.Texture.Width);
face.TextureMapping.VScale = Math.Abs((projMaxV - projMinV) / face.Texture.Height);
face.TextureMapping.UShift = -projMinU / face.TextureMapping.UScale;
face.TextureMapping.VShift = -projMinV / face.TextureMapping.VScale;
}
public SolidVertex[] GetVerticesForFace(SolidFace face)
{
List <SolidVertex> vertices = new List <SolidVertex>();
foreach (SolidIndex vertexIndex in face.Indices)
{
if (vertexIndex.Index > VertexPositions.Count)
{
continue;
}
SolidVertex vertex = new SolidVertex
{
DiffuseUv = vertexIndex.DiffuseUv,
Position = VertexPositions[vertexIndex.Index]
};
vertices.Add(vertex);
}
return(vertices.ToArray());
}
/// <summary>
/// Align texture axis to a world plane
/// U is to the right and V is down,
/// Opengl uses U to the right en V is up
/// </summary>
/// <param name="face"></param>
public void AlignTextureAxisToWorldForFace(SolidFace face)
{
if (face.TextureMapping.TextureLocked)
{
return;
}
Vector3 axisNormal = new Plane(face.Normal, 0.0f).GetClosestAxisForPlaneNormal();
// generate uv axis
face.TextureMapping.UAxis = axisNormal == Vector3.UnitX ? Vector3.UnitZ : Vector3.UnitX;
face.TextureMapping.VAxis = axisNormal == Vector3.UnitY ? -Vector3.UnitZ : -Vector3.UnitY;
// check if V axis is 90 degrees counterclockwise of U axis else make it
// for our perspective it is clockwise, but positive rotation mathematically is counterclockwise
if (face.TextureMapping.VAxis.SignedAngleTo(face.TextureMapping.UAxis, face.Normal) > 0)
{
face.TextureMapping.UAxis = -face.TextureMapping.UAxis;
}
face.TextureMapping.Rotation = 0;
}