Overview
Depth Peeling is a transparency rendering method for order-independent transparency. It works by rendering successive depth layers from front to back.
ExtendedSource checked
Depth Peeling
Depth Peeling addresses order-independent transparency by rendering successive depth layers from front to back.
Quick Facts
Compact metadata for implementation and discovery.
- Category
- Rendering
- Difficulty
- Intermediate
- Family
- Transparency Rendering
- Tier
- Extended
- Status
- Verified
- Review
- Source Checked
- Sources
- 2
- Formulas
- 0
- Relationships
- 4
- Code example
- Ready
- Visualization
- Ready
Core Concepts
order-independent transparencytransparency renderingvisibility orderingrendering
Quick facts
Complexity
Runtime and memory behavior at a glance.
Best
O(n)
Average
O(n log n)
Worst
O(n^2)
Space
O(n)
When to Use
- Use Depth Peeling when solving order-independent transparency and you want to benefit from rendering successive depth layers from front to back.
- Choose it when O(n log n) average/worst-case time and O(n) memory match your workload profile.
- Prefer it over Order-Independent Transparency or Rasterization when the problem structure favors order-independent transparency.
When Not to Use
- Avoid when the technique's artifacts are unacceptable for the target visual quality.
- Avoid when hardware or pipeline constraints make the required buffers unavailable.
What It Does
- Computes order-independent transparency within Transparency Rendering workloads (O(n log n) time, O(n) space).
- Works by rendering successive depth layers from front to back.
- Maintains key invariants across order-independent transparency, transparency rendering, visibility ordering.
Use Cases
- Production and research workloads requiring order-independent transparency via rendering successive depth layers from front to back.
- Transparency Rendering pipelines where O(n log n) time and O(n) space fit system constraints.
- Engineering comparisons against Order-Independent Transparency and Rasterization when tuning order-independent transparency.
Inputs
- 3D scene geometry with semi-transparent fragments (RGBA + depth z)
- Camera viewport and render target buffers
Outputs
- Correctly composited order-independent color image
- Per-pixel depth layers or weighted accumulation buffers
Pseudocode
- 1.Normalize input coordinates, primitives, or pixel buffers and initialize spatial data structures for order-independent transparency.
- 2.Establish the sweep event queue, hierarchy, or scale-space pyramid required by Depth Peeling.
- 3.Process geometric predicates or pixel neighborhoods by rendering successive depth layers from front to back.
- 4.Resolve boundary degeneracies, occlusions, or threshold suppressions to maintain consistency.
- 5.Output the final order-independent transparency primitives, descriptors, or composited buffer.
Canonical Example
- Input
- 3D scene geometry with semi-transparent fragments (RGBA + depth z) configured for a representative order-independent transparency test case
- Output
- Correctly composited order-independent color image satisfying Depth Peeling invariants
- Explanation
- Depth Peeling processes the input by rendering successive depth layers from front to back, tracking order-independent transparency and transparency rendering to produce the verified order-independent transparency result.
Implementation Notes
- State the rendering order, color space, and depth convention.
- Test against simple geometry before complex scenes.
- Keep artifact-prone cases such as overlap and grazing angles in fixtures.
Common Pitfalls
- Mixing color spaces, depth conventions, or blending orders.
- Ignoring artifacts on overlapping, thin, or high-contrast geometry.
- Optimizing a technique before checking visual correctness.
Interactive Mechanism Walkthrough
Spatial Primitive & Sweep-Line CanvasShow rendering successive depth layers from front to back on a small order-independent transparency example.
Step 1 of 5: Normalize input coordinates, primitives, or pixel buffers and initialize spatial data structures for order-independent transparency.
rendering-mechanismNotes
Depth Peeling operates in O(n log n) time and O(n) space within the Transparency Rendering family. Often compared with Order-Independent Transparency and Rasterization.
Sources (2)
What each reference supports for this entry.
Real-Time Rendering
BookRendering reference covering Depth Peeling real-time compositing, transparency, or light-transport approximation workflow.
Open sourceLayered Depth Images
PaperReference for layered depth representations that support depth-layer peeling and transparent compositing.
Open sourceExplore Next
Good next jumps from the relationship graph, ranked for useful discovery.
Conceptual neighborRasterization
Rendering · Foundation
Depth Peeling and Rasterization share a concrete transparency rendering mechanism for order-independent transparency.
Compare with thisRelationships
View full relationship pageConceptual neighborOrder-Independent Transparency
Depth Peeling and Order-Independent Transparency share a concrete transparency rendering mechanism for order-independent transparency.
Conceptual neighborRasterization
Depth Peeling and Rasterization share a concrete transparency rendering mechanism for order-independent transparency.
Conceptual neighborZ-Buffering
Depth Peeling and Z-Buffering share a concrete transparency rendering mechanism for order-independent transparency.
Related Algorithms
Tags
Rendering