One thing that might help is to study the Position Texture tool - observe how the texture pins are placed on the surface of the face.
model = Sketchup.active_model
model.active_entities.clear!
texture_path = Sketchup.find_support_file('/Materials/Brick, Cladding and Siding/Brick Colored Blue.skm')
material = model.materials.load(texture_path)
points = [ # World space coordinates
Geom::Point3d.new( 0, 0, 0),
Geom::Point3d.new(1.m, 0, 0),
Geom::Point3d.new(1.m, 1.m, 0),
Geom::Point3d.new( 0, 1.m, 0),
]
face = model.active_entities.add_face(points)
face.reverse! unless face.normal.samedirection?(Z_AXIS)
# Position texture to fit face:
uvs = [ # UV coordinates
Geom::Point3d.new(0, 0),
Geom::Point3d.new(1, 0),
Geom::Point3d.new(1, 1),
Geom::Point3d.new(0, 1),
]
mapping = [
points[0], uvs[0],
points[1], uvs[1],
points[2], uvs[2],
points[3], uvs[3],
]
# This could also be done via .zip - but the above illustrates clearer the order
# of the data.
# points.zip(uvs).flatten
face.position_material(material, mapping, true)
# Position tile across the face 2 times horizontally and 4 times vertically:
uvs = [ # UV coordinates
Geom::Point3d.new(0, 0),
Geom::Point3d.new(2, 0),
Geom::Point3d.new(2, 4),
Geom::Point3d.new(0, 4),
]
mapping = points.zip(uvs).flatten
face.position_material(material, mapping, true)
# Position tile across the face 2 times horizontally and 4 times vertically.
# and rotate by 45 degrees:
uvs = [ # UV coordinates
Geom::Point3d.new(0, 0),
Geom::Point3d.new(2, 0),
Geom::Point3d.new(2, 4),
Geom::Point3d.new(0, 4),
]
# Instead of pinning the UVs to the vertices of the face, we pin them to points
# on the plane of the face. Similar to what the Position Texture tool does:
rotation_origin = Geom::Point3d.new(0, 0)
tr = Geom::Transformation.rotation(rotation_origin, face.normal, 45.degrees)
face_points = points.map { |uv| uv.transform(tr) }
mapping = face_points.zip(uvs).flatten
face.position_material(material, mapping, true)
In the above illustration the red square are the points on the face of the plane, they are rotated 45 degrees of the original vertices. Because the UV values remain the same you get the desired rotation. (Did that make sense?)
