Curved surface generation device and curved surface generation program

A surface generation device comprising:

• shape data input unit configured to input shape data of a model;
• a profile curve setting unit configured to set, into a computer, profile curve fitted to a part of the shape data;
• a profile curve movement unit configured to perform a sweeping process by translating and rotating the profile curve set by the profile curve setting unit, and to decide a pseudo guide line satisfying a predetermined condition;
• and
• a surface generation unit configured to generate surface data defined by a locus obtained by adjusting the profile curve using the sweeping process of the profile curve movement unit,
• wherein the predetermined condition includes a first condition, relating to a shape feature of a surface, that is a condition for matching the pseudo guide line expressed as a locus of one point on the profile curve moved by the sweeping process of the profile curve movement unit with a flow of surface data to be generated, and in which the pseudo guide line becomes a line of curvature of the surface data;
• wherein the profile curve movement unit has
• a first movement processing unit configured to obtain, at every predetermined interval, a tangent vector indicating a direction of the locus obtained by translating one point on the profile curve by performing a first movement process for translating the profile curve set by the profile curve setting unit, and
• a second movement processing unit configured further move the profile curve obtained at every predetermined interval through translating and rotating the profile curve so as to satisfy the predetermined condition by setting each of the tangent vectors obtained at every predetermined interval by the first movement process of the first movement processing unit as an initial vector;
• and
• wherein the second movement processing unit moves the profile curve the profile curve by rotation using a rotation minimizing frame without rotation in a direction of the tangent vector by rotating the profile curve about one point on the profile curve such that the tangent vector indicating a direction of next translation of the profile curve matches a tangent vector indicating a direction of translation of the profile curve before the predetermined interval.

A non-transitory computer readable medium storing a surface generation program that, when executed by a system including electronic computer hardware, cause the system to perform operations comprising:

• inputting shape data of a model;
• setting a profile curve fitted to a part of the shape data;
• applying a sweep process by translating and rotating the profile curve and decide a pseudo guide line satisfying a predetermined condition;
• and
• generating surface data defined by a locus obtained by adjusting the profile curve using the sweep process,
• wherein the predetermined condition includes a first condition, relating to a shape feature of a surface, in which a pseudo guide line expressed as the locus of one point on the profile curve moved by the sweeping process becomes a line of curvature of the surface data to be generated, and the pseudo guide line has a small torsion.

A method, comprising:

• inputting shape data of a model;
• setting a profile curve fitted to a part of the shape data;
• applying a sweep process by translating and rotating the profile curve and decide a pseudo guide line satisfying a predetermined condition;
• and
• generating surface data defined by a locus obtained by adjusting the profile curve using the sweep process,
• wherein the predetermined condition includes a first condition, relating to a shape feature of a surface, in which a pseudo guide line expressed as the locus of one point on the profile curve moved-by the sweeping process becomes a line of curvature of the surface data to be generated, and the pseudo guide line has a small torsion.

A non-transitory computer readable medium storing a surface generation program that, when executed by a system including electronic computer hardware, cause the system to perform operations comprising:

• inputting shape data of a model;
• setter a profile curve fitted to a part of the shape data;
• applying a sweep process by translating and rotating the profile curve and decide a pseudo guide line satisfying a predetermined condition;
• and
• generating surface data defined by a locus obtained by adjusting the profile curve using the sweep process,
• wherein the predetermined condition includes a first condition, relating to a shape feature of a surface, that is a condition for matching the pseudo guide line expressed as a locus of one point on the profile curve moved by the sweeping process with a flow of surface data to be generated, and in which the pseudo guide line becomes a line of curvature of the surface data;
• wherein the sweep process includes a first movement processing and a second movement processing,
• the first movement processing is a processing that is obtaining, at every predetermined interval, a tangent vector indicating a direction of the locus obtained by translating one point on the profile curve by performing a movement process for translating the profile curve,
• the second movement processing is a processing that is performing further moving the profile curve obtained at every predetermined interval through translating and rotating the profile curve so as to satisfy the predetermined condition by setting each of the tangent vectors obtained at every predetermined interval by the first movement processing as an initial vector;
• and
• wherein the second movement processing is a processing that is moving the profile curve by rotation using a rotation minimizing frame without rotation in a direction of the tangent vector by rotating the profile curve about one point on the profile curve such that the tangent vector indicating a direction of next translation of the profile curve matches a tangent vector indicating a direction of translation of the profile curve before the predetermined interval.

A method, comprising:

• inputting shape data of a model;
• setting a profile curve fitted to a part of the shape data;
• applying a sweep process by translating and rotating the profile curve and decide a pseudo guide line satisfying a predetermined condition;
• and
• generating surface data defined by a locus obtained by adjusting the profile curve using the sweep process,
• wherein the predetermined condition includes a first condition, relating to a shape feature of a surface, that is a condition for matching the pseudo guide line expressed as a locus of one point on the profile curve moved by the sweep process with a flow of surface data to be generated, and in which the pseudo guide line becomes a line of curvature of the surface data and the pseudo guide line has a small torsion;
• wherein the sweep process includes a first movement processing and a second movement processing,
• the first movement processing is a processing that is obtaining, at every predetermined interval, a tangent vector indicating a direction of the locus obtained by translating one point on the profile curve by performing a movement process for translating the profile curve,
• the second movement processing is a processing that is further moving the profile curve obtained at every predetermined interval through translating and rotating the profile curve so as to satisfy the predetermined condition by setting each of the tangent vectors obtained at every predetermined interval by the first movement processing as an initial vector;
• and
• wherein the second movement processing is a processing that is moving the profile curve by rotation using a rotation minimizing frame without rotation in a direction of the tangent vector by rotating the profile curve about one point on the profile curve such that the tangent vector indicating a direction of next translation of the profile curve matches a tangent vector indicating a direction of translation of the profile curve before the predetermined interval.