Basic 3D

3D Point and Orthographic

Project a 3D point orthographically by keeping x and y and dropping z.

Example

Drop z to project a 3D point orthographically.

highlighted = computed this step

Step 1 — 3D point

Set up the exact input values.

P(2, 3, 4)\begin{array}{c|c}\text{P}&\text{(2, 3, 4)}\end{array}

Step 2 — Drop z

Compute the highlighted value.

dropped z4\begin{array}{c|c}\text{dropped z}&\hlmath{\text{4}}\end{array}

Step 3 — Screen point

Compute the highlighted value.

P prime(2, 3)\begin{array}{c|c}\text{P prime}&\hlmath{\text{(2, 3)}}\end{array}
Orthographic projectionThe projected point keeps x and y and drops z.P'
3d-point-and-orthographic Orthographic projection is the simplest 3D-to-2D projection: z does not change the screen location.