How are vertices oriented in a 3D world?
In the next stage, the vertices that describe your 3D world are oriented with respect to a camera. That is, your application chooses a point-of-view for the scene, and world space coordinates are relocated and rotated around the camera’s view, turning world space into camera space.
When do vertex positions need to be transformed?
View Transform: The world space vertex positions (and normals) need to be transformed into a space that is relative to the view of the camera. This is called “view space” (sometimes referred to “camera space”) and is the transformation that will be studied in this article.
How to transform vertex coordinates from view to clip-space?
To transform vertex coordinates from view to clip-space we define a so called projection matrix that specifies a range of coordinates e.g. -1000 and 1000 in each dimension. The projection matrix then transforms coordinates within this specified range to normalized device coordinates (-1.0, 1.0).
How are the vertices of a model declared?
At the head of the pipeline, a model’s vertices are declared relative to a local coordinate system. This is a local origin and an orientation. This orientation of coordinates is often referred to as model space, and individual coordinates are called model coordinates.
How to make the rotation of an object the same?
Press Ctrl A > Apply Visual Transform make their actual rotation the same as the constrained rotation. Remove the constraint from one by pressing the X on the constraint in Properties > Constraints. Copy it to the others with 3D View > Header > Object > Constraints > Copy Constraints to Selected Objects.
What are the coordinates of the vertices in OpenGL?
OpenGL expects all the vertices, that we want to become visible, to be in normalized device coordinates after each vertex shader run. That is, the x, y and z coordinates of each vertex should be between -1.0 and 1.0; coordinates outside this range will not be visible.