/// <summary>
/// Loads all <see cref="Vertex"/> objects references by <paramref name="face"/> and loads their
/// data into a <see cref="Mesh"/>, along with triangles, and returns the result.
/// </summary>
/// <param name="bsp">The <see cref="BSP"/> which <paramref name="face"/> comes from.</param>
/// <param name="face">The <see cref="Face"/> to build a <see cref="Mesh"/> from.</param>
/// <returns>A <see cref="Mesh"/> built from the data given by <paramref name="face"/>.</returns>
public static Mesh CreateFaceMesh(BSP bsp, Face face, Vector2 dims, int curveTessellationLevel)
{
Mesh mesh = null;
if (face.numVertices > 0)
{
if (face.firstIndex == 0 && face.numIndices == 0 && face.flags == 2)
{
mesh = CreatePatchMesh(bsp, face, curveTessellationLevel);
}
else
{
mesh = LoadVerticesFromFace(bsp, face);
}
}
else if (face.numEdges > 0)
{
mesh = LoadVerticesFromEdges(bsp, face);
}
if (mesh != null)
{
TextureInfo textureInfo = bsp.GetTextureInfo(face);
if (textureInfo.Data != null && textureInfo.Data.Length > 0)
{
mesh.CalculateUVs(textureInfo, dims);
}
mesh.NegateVs();
}
return(mesh);
}
/// <summary>
/// Builds a Displacement <see cref="Mesh"/> from the <see cref="DisplacementInfo"/> referenced by
/// <paramref name="face"/>, with UVs calculated from <see cref="Face.textureInfo"/> using
/// <paramref name="dims"/> as the <see cref="Texture2D"/> width and height.
/// </summary>
/// <param name="bsp">The <see cref="BSP"/> object which <paramref name="face"/> came from.</param>
/// <param name="face">A face referencing a <see cref="DisplacementInfo"/> and a <see cref="TextureInfo"/>.</param>
/// <param name="dims">The dimensions of the <see cref="Texture2D"/> to map onto the resulting <see cref="Mesh"/>.</param>
/// <returns>The <see cref="Mesh"/> created from the <see cref="DisplacementInfo"/>.</returns>
public static Mesh CreateDisplacementMesh(BSP bsp, Face face, Vector2 dims)
{
Mesh mesh = null;
if (face.numEdges > 0)
{
mesh = LoadVerticesFromEdges(bsp, face);
}
else
{
Debug.LogWarning("Cannot create displacement, face contains no edges.");
return(null);
}
Vector3[] faceCorners = mesh.vertices;
int[] faceTriangles = mesh.triangles;
if (faceCorners.Length != 4 || faceTriangles.Length != 6)
{
Debug.LogWarning("Cannot create displacement mesh because " + faceCorners.Length + " corners and " + faceTriangles.Length + " triangle indices.");
return(null);
}
DisplacementInfo displacementInfo = bsp.dispInfos[face.displacement];
int numSideTriangles = (int)Mathf.Pow(2, displacementInfo.power);
DisplacementVertex[] displacementVertices = bsp.dispVerts.GetVerticesInDisplacement(displacementInfo.dispVertStart, displacementInfo.power);
Vector3[] corners = new Vector3[4];
Vector3 start = displacementInfo.startPosition.SwizzleYZ() * inch2MeterScale;
if ((faceCorners[faceTriangles[0]] - start).sqrMagnitude < .01f)
{
corners[0] = faceCorners[faceTriangles[0]];
corners[1] = faceCorners[faceTriangles[1]];
corners[2] = faceCorners[faceTriangles[5]];
corners[3] = faceCorners[faceTriangles[4]];
}
else if ((faceCorners[faceTriangles[1]] - start).sqrMagnitude < .01f)
{
corners[0] = faceCorners[faceTriangles[1]];
corners[1] = faceCorners[faceTriangles[4]];
corners[2] = faceCorners[faceTriangles[0]];
corners[3] = faceCorners[faceTriangles[5]];
}
else if ((faceCorners[faceTriangles[5]] - start).sqrMagnitude < .01f)
{
corners[0] = faceCorners[faceTriangles[5]];
corners[1] = faceCorners[faceTriangles[0]];
corners[2] = faceCorners[faceTriangles[4]];
corners[3] = faceCorners[faceTriangles[1]];
}
else if ((faceCorners[faceTriangles[4]] - start).sqrMagnitude < .01f)
{
corners[0] = faceCorners[faceTriangles[4]];
corners[1] = faceCorners[faceTriangles[5]];
corners[2] = faceCorners[faceTriangles[1]];
corners[3] = faceCorners[faceTriangles[0]];
}
else
{
Debug.LogWarning("Cannot create displacement mesh because start position isn't one of the face corners.\n" +
"Start position: " + start + "\n" +
"Corners: " + faceCorners[faceTriangles[0]] + " " + faceCorners[faceTriangles[1]] + " " + faceCorners[faceTriangles[5]] + " " + faceCorners[faceTriangles[4]]);
return(null);
}
Vector3[] offsets = new Vector3[displacementVertices.Length];
for (int i = 0; i < displacementVertices.Length; ++i)
{
offsets[i] = displacementVertices[i].normal.SwizzleYZ() * displacementVertices[i].dist * inch2MeterScale;
}
Vector2[] uv = new Vector2[4];
Vector2[] uv2 = new Vector2[4];
mesh.vertices = corners;
mesh.uv = uv;
mesh.uv2 = uv2;
mesh.CalculateUVs(bsp.GetTextureInfo(face), dims);
mesh.CalculateTerrainVertices(offsets, numSideTriangles);
mesh.triangles = BuildDisplacementTriangles(numSideTriangles);
mesh.NegateVs();
mesh.RecalculateNormals();
mesh.RecalculateBounds();
return(mesh);
}
