Do all thing in memory and write the whole thing to file at the end which is fast and also add capability to work with memory instead of files. With ASCII formats you can do this inside String variable so you can easily insert into or modify. Write the chunks you need (points list, faces list, normals. If the format has any directory structure fill it and write it (IGES)įor sub-objects do not forget to add transformation matrices. create header and structure of target file format.Like what primitives you use, are your object simple or in skeleton hierarchy, are you using textures, and more. You did not provide any info about your 3D mesh model structure and capabilities
#Geometrical shapes in 3d code
Mine IGES loader class is about 30KB of C++ source code look here for more info I code importers which are much much more complicated. In your case I would use IGES (Initial Graphics Exchange Specification)įor export you do not need to implement all just few basic shapes so it would not be too difficult.
#Geometrical shapes in 3d software
This way you will be compatible with other software and eliminate incompatibility problems which are native to creating 'almost known' binary formats like 3ds. Chose one that is most suitable for your needs and code save/load function to your Apps internal model class/struct. This approach is easily verifiable in note pad or by loading to some 3D model viewer. I do not recommend to use itĪt first look it is quite easy but the sub-object implementation is really tricky. This one is even more complicated then IGES. It supports Volume operation like +,-,&,^ which are VERY HARD to implement properly but you do not have to use them :) This one is a bit complicated but for export purposes it is not that bad. *.iges common and importable on most CAD/CAM platform (Catia included) Just copy the templates (at the start) from any *.x file to get started. If you do not want to spend too much time coding then this is the right choice. This one is easiest to implement !!! But there are not many tools that can handle them. *.x DirectX object (it is a C++ source code) All points on the surface of a sphere are equidistant from a point called the center.I strongly recommend to use some ASCII exchange format there are many out there I usually use these: SphereĪ sphere is a 3D shape that has a round shape. ConeĪ cone is a 3D shape that is made up of a circular base that tapers to a point. CylinderĪ cylinder is a 3D shape that is made up of two flat circular bases and a curved surface that "wraps" around the bases. In geometry, three types of non-polyhedra that are commonly studied are cylinders, cones, and spheres. Non-polyhedraĪ non-polyhedron is a space figure that has at least one face or component that is not a polygon. Polyhedra are 3D shapes that can take on many other shapes. Below are three examples of pyramids with different bases. Like a prism, a pyramid is also typically named based on the shape of its polygonal base. The triangular faces (aside from the base of a triangular pyramid) all share a common vertex called the apex. Pyramids are polyhedra that contain only one polygonal base all the other faces are triangles. A prism is typically named based on the shape of its polygonal bases. The other faces (the sides that are not bases) are parallelograms, rectangles, or squares. Prisms are polyhedra that have two congruent faces, called bases, that lie in parallel planes. Prisms and pyramids are two examples of polyhedra that are commonly studied in geometry.
The word polyhedron has Greek origins, meaning many faces. PolyhedraĪ polyhedron is a 3D shape whose faces are polygons. Types of 3D shapesģD shapes can be classified in many different ways, such as polyhedra (plural for polyhedron) and non-polyhedra. When a 3D shape is closed, its volume and surface area can be determined. Home / geometry / shape / 3d-shapes 3D-shapesĪ three-dimensional (3D) shape is a shape or geometric figure that has length, width and height.
0 kommentar(er)
