What gets lost or altered when a 3D object is represented in 2D?

What gets lost or altered when a 3D object is represented in 2D?

The answer has two aspect: 1- If you have no prior information about 3D scene, for example unknown scene, one dimension of three dimension will be lost. It means that you may lose depth information (Z axes), when you want to transform (X,Y,Z) from 3D scene to (x,y) in 2D image dimension.

What is difference between 2D and 3D shapes?

A 2D shape has two dimensions- Length and Breadth. 2D figures are also referred to as plane figures or plane shapes since these figures lie on a flat surface. 2D shapes have areas but not volume. A 3D shapes have three dimensions- Length, Breadth, and Height or Depth.

How to add vertices to a viewport in Autodesk?

If you create polygonal viewports or convert objects to a viewport, you can use the standard pedit on them and then V for vertices and then I for insert. It works but you have to have created the viewport by one of the previous two methods.

How are viewports and clipping used in Direct3D 9?

Viewports and Clipping (Direct3D 9) Conceptually, a viewport is a two-dimensional (2D) rectangle into which a 3D scene is projected. In Direct3D, the rectangle exists as coordinates within a Direct3D surface that the system uses as a rendering target. The projection transformation converts vertices into the coordinate system used for the viewport.

How does Direct3D calculate the depth of a vertex?

Internally, Direct3D inserts these values into the following matrix that is applied to each vertex. This matrix scales vertices according to the viewport dimensions and desired depth range and translates them to the appropriate location on the render-target surface.

How to convert a 3D point into 2D perspective projection?

Transform your 3D points with the inverse camera matrix, followed with whatever transformations they need. If you have surface normals, transform them as well but with w set to zero, as you don’t want to translate normals. The matrix you transform normals with must be isotropic; scaling and shearing makes the normals malformed.