public static void BarkMapping(MaterialData mat, TriangleData triangle, List <Vector2> uvs)
{
Vector3 a = TriangleData.GetVector(triangle, 0);
Vector3 b = TriangleData.GetVector(triangle, 1);
Vector3 c = TriangleData.GetVector(triangle, 2);
Vector3 normal = Vector3.Cross(a - b, a - c).normalized;
Vector2 uva = Vector2.zero;
Vector2 uvb = Vector2.zero;
Vector2 uvc = Vector2.zero;
// Sides are 0, top/bottom is 1. This info should be provided by the
// MaterialData object. Won't work for bark materials, will it?
// Don't implement this yet. I need to see how MaterialData matures.
// MaterialIndex.GetTileIndex(mi, materialData, SIDE);
int tile = 0;
if (IsAlignedX(normal, axisAlignThreshold))
{
uva = ProjectX(a, mat.halfSize, mat.size);
uvb = ProjectX(b, mat.halfSize, mat.size);
uvc = ProjectX(c, mat.halfSize, mat.size);
// Pick a vertex and see if it is a part of the bark
tile = (a.x < -(mat.halfSize.x - mat.barkThickness.x)) ||
(a.x > mat.halfSize.x - mat.barkThickness.x)
? 0
: 1;
}
if (IsAlignedZ(normal, axisAlignThreshold))
{
uva = ProjectZ(a, mat.halfSize, mat.size);
uvb = ProjectZ(b, mat.halfSize, mat.size);
uvc = ProjectZ(c, mat.halfSize, mat.size);
tile = (a.z < -(mat.halfSize.z - mat.barkThickness.x)) ||
(a.z > mat.halfSize.z - mat.barkThickness.x)
? 0
: 1;
}
if (IsAlignedY(normal, axisAlignThreshold))
{
uva = ProjectY(a, mat.halfSize, mat.size);
uvb = ProjectY(b, mat.halfSize, mat.size);
uvc = ProjectY(c, mat.halfSize, mat.size);
tile = (a.y < -(mat.halfSize.y - mat.barkThickness.y)) ||
(a.y > mat.halfSize.y - mat.barkThickness.y)
? 2
: 3;
}
uvs[triangle.indices[0]] = RemapUVCoordToTile(mat, uva, tile);
uvs[triangle.indices[1]] = RemapUVCoordToTile(mat, uvb, tile);
uvs[triangle.indices[2]] = RemapUVCoordToTile(mat, uvc, tile);
}
// Projects textures along the cardinal axis.
// The bark texture is applied to the sides, no
// matter how far into the mesh you slice.
public static void ProjectionMapping(MaterialData mat, TriangleData triangle, List <Vector2> uvs)
{
Vector3 a = TriangleData.GetVector(triangle, 0);
Vector3 b = TriangleData.GetVector(triangle, 1);
Vector3 c = TriangleData.GetVector(triangle, 2);
Vector3 normal = Vector3.Cross(a - b, a - c).normalized;
Vector2 uva = Vector2.zero;
Vector2 uvb = Vector2.zero;
Vector2 uvc = Vector2.zero;
// Sides are 0, top/bottom is 1.
// This info should be provided by the
// MaterialData object.
// MaterialIndex.GetTileIndex(mi, materialData, SIDE);
// Tile 0 is the side with bark
int tile = 0;
// Check if the normal is within a range of +/- 85 deg
// of the world Y axis.
if (IsAlignedY(normal, 85f))
{
uva = ProjectY(a, mat.halfSize, mat.size);
uvb = ProjectY(b, mat.halfSize, mat.size);
uvc = ProjectY(c, mat.halfSize, mat.size);
// Tile 3 is the edge without bark
tile = 3;
}
// These checks fail when slicing at an angle outside
// axisAlignThreshold. Could improve the IsAligned functions
// to accept an axis to project along. That way I could
// project the texture along the normal of the triangle.
// how would that translate to UV coords?
if (IsAlignedX(normal, axisAlignThreshold))
{
uva = ProjectX(a, mat.halfSize, mat.size);
uvb = ProjectX(b, mat.halfSize, mat.size);
uvc = ProjectX(c, mat.halfSize, mat.size);
}
if (IsAlignedZ(normal, axisAlignThreshold))
{
uva = ProjectZ(a, mat.halfSize, mat.size);
uvb = ProjectZ(b, mat.halfSize, mat.size);
uvc = ProjectZ(c, mat.halfSize, mat.size);
}
uvs[triangle.indices[0]] = RemapUVCoordToTile(mat, uva, tile);
uvs[triangle.indices[1]] = RemapUVCoordToTile(mat, uvb, tile);
uvs[triangle.indices[2]] = RemapUVCoordToTile(mat, uvc, tile);
}
