Computer-readable recording medium which stores rendering program, rendering apparatus and rendering method

A rendering apparatus for rendering a sterical model that is created beforehand in a virtual three-dimensional space, the apparatus comprising:

• a model acquisition portion for acquiring the sterical model;
• a texture acquisition portion for acquiring a texture of a fabric which includes height information representing the shape of a surface of the fabric and fiber direction information indicating a fiber direction of a yarn configuring the fabric, and which is attached to a surface of the sterical model;
• a rendering portion for rendering the sterical model by using the texture and a reflection function expressing an energy of reflected light of the yarn that corresponds to a ray direction, an eye direction and the fiber direction information in the virtual three-dimensional space;
• a reflection property acquisition portion for acquiring a reflection property of an actual yarn that is obtained by measuring an energy of reflected light of the actual yarn after changing the ray direction and the eye direction;
• and
• a correction portion for correcting the reflection function so that an error between the reflection property acquired by the reflection property acquisition portion and the energy of the reflected light of the yarn obtained from the reflection function becomes minimum, wherein
• the rendering portion renders the sterical model by using the reflection function corrected by the correction portion.

A rendering method for rendering a sterical model that is created beforehand in a virtual three-dimensional space, the method comprising:

• a step in which a computer acquires the sterical model;
• a step in which the computer acquires a texture of a fabric which includes height information representing the shape of a surface of the fabric and fiber direction information indicating a fiber direction of a yarn configuring the fabric, and which is attached to a surface of the sterical model;
• a step in which the computer renders the sterical model by using the texture and a reflection function expressing an energy of reflected light of the yarn that corresponds to a ray direction, an eye direction and the fiber direction information in the virtual three-dimensional space;
• a step in which the computer acquires a reflection property of an actual yarn that is obtained by measuring an energy of reflected light of the actual yarn after changing the ray direction and the eye direction and;
• and
• a step in which the computer corrects the reflection function so that an error between the reflection property and the energy of the reflected light obtained from the reflection function becomes minimum, wherein
• the rendering step renders the sterical model by using the reflection function corrected.