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Stencil buffer
Description
Stenciling,
like depth-buffering, enables and disables drawing on a per-fragment
basis.
Source: Down to Earth Style
Similar to how a painter might limit drawing to a defined region using a stencil.
The stencil buffer is stored as an additional buffer on the graphics card. Storage is associated with each framebuffer pixel. If enabled, the stencil buffer can be written to during rendering.
When rendering other geometry, each fragment can be tested against the stencil buffer
Example:
Create a mask in the stencil buffer and only draw objects in the masked area.
Mirror-like reflection off the ground plane, by multi-pass rendering.
Source: O'Reilly
- A stencil is first created, usually by rendering primitives
- Subsequent rendering uses the stencil to mask out portions of the screen
- Stenciling
is often used in multi-pass rendering
Source: Down to Earth Style
Similar to how a painter might limit drawing to a defined region using a stencil.
The stencil buffer is stored as an additional buffer on the graphics card. Storage is associated with each framebuffer pixel. If enabled, the stencil buffer can be written to during rendering.
When rendering other geometry, each fragment can be tested against the stencil buffer
- Fragments that pass the test are rendered
- Fragments that fail the test are discarded
Example:
Create a mask in the stencil buffer and only draw objects in the masked area.
Mirror-like reflection off the ground plane, by multi-pass rendering.
Source: O'Reilly
Importance
High
Additional information
Demo: solid and wireframe
