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When the Mapping list is set to Auto, an automatic planar projection algorithm is used to map the image to the surfaces. The Auto setting always finds the best fitting plane and projects on it while choosing a suitable projection size. If the Preserve aspect ratio check is selected (the default), then the image’s aspect ratio is preserved by the automatic mapping algorithm. If the image and the data have aspect ratios, then some padding must be added. The images are centered in the dimension where padding is needed.
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When you select Manual from the Mapping list, you get access to more detailed control over the mapping. Each point on the surface is mapped to a pixel in the image. This functionality can be used for more advanced mappings. The following example provides a mapping that embeds a world map that uses an equirectangular projection on a sphere of radius r centered at the origin (when using a relative coordinate interpretation):
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When you select Planar from the Mapping list, you can define a plane for the image to be mapped to. From the Plane type list, choose one of the following planes: xy-plane, yz-plane, zx-plane, yx-plane, zy-plane, xz-plane, Auto (the default), or General. For Auto, the software chooses the plane type that best suits the selected surfaces.
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When you select Cylindrical from the Mapping list, you get a cylindrical mapping of the image. Specify the position of the cylinder (center of the bottom circle) in the x, y, and z fields under Position, and from the Axis type list under Axis, choose X-axis, Y-axis, Z-axis (the default), Cartesian, or Spherical. For Cartesian, specify the axis direction in the x, y, and z fields. For Spherical, specify the axis direction in the theta and phi fields as θ and φ angles in degrees. Also specify a rotation angle, in degrees, if desired, in the Rotation field.
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When you select Spherical from the Mapping list, you get a spherical mapping of the image. Specify the position of the sphere’s center in the x, y, and z fields under Position, and from the Axis type list under Axis, choose X-axis, Y-axis, Z-axis (the default), Cartesian, or Spherical. For Cartesian, specify the axis direction in the x, y, and z fields. For Spherical, specify the axis direction in the theta and phi fields as θ and φ angles in degrees. Also specify a rotation angle, in degrees, if desired, in the Rotation field.
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When you select Rectangular from the Mapping list, you define a rectangle for the image to be mapped to. Enter a Width under Size, which is the side length that the image will have, interpreted in the length unit of the geometry that the solution dataset refers to. The Height will be computed based on the image’s size.
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The coordinate names above are the default names: x, y, and z, but they can vary depending on the physics and setup of the current model.
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