Texture generation system

A method for generating a texture representing an appearance of a feature in a three-dimensional map, executed by a computer, the method comprising:

• providing a map database storing a three-dimensional model representing a three-dimensional shape of the feature with at least one polygon, and a plurality of types of unit textures to be selectively applied to the feature;
• providing a matrix of a predetermined size, each pixel of the matrix storing a control value for controlling selection of the unit texture;
• and
• generating a texture for the polygon as an array of a plurality of the unit textures with at least two types by referring to the map database and the matrix, the generating the texture for the polygon comprising:
• associating each position of the array with a pixel of the matrix;
• selecting one of the plurality of types of the unit textures for each position based on the control value stored in the pixel of the matrix associated with the position;
• and
• arranging and pasting the selected unit texture onto each position so as to provide the array of the unit textures on the polygon;
• and
• applying the generated texture to the feature in the three-dimensional map.

A non-transitory computer readable medium storing a computer program for causing a computer to execute process steps for generating a texture representing an appearance of a feature in a three-dimensional map, wherein the process steps comprising:

• referring to a map database storing the three-dimensional model representing a three-dimensional shape of the feature with at least one polygon, and a plurality of types of unit textures to be selectively applied to the feature;
• referring to a matrix of a predetermined size, each pixel of the matrix storing a control value for controlling selection of the unit texture;
• and
• generating a texture for the polygon as an array of a plurality of the unit textures with at least two types, wherein the generating the texture for the polygon includes:
• associating each position of the array with a pixel of the matrix;
• selecting one of the plurality of types of the unit textures for each position based on the control value stored in the pixel of the matrix associated with the position;
• and
• arranging and pasting the selected unit texture onto each position so as to provide the array of the unit textures on the polygon;
• and
• applying the generated texture to the feature in the three-dimensional map.