The DOI matches its Crossref record.
The notion of quantitative invisibility and the machine rendering of solids
Open accessAbstract
Line drawings are the most common type of rendering used to convey geometrical description. This is due to the economy of preparing such drawings and the great information density obtainable. On a pure line drawing, that is where no attempt is made to specify or suggest shadows, tone or color, the lines rendered are either the intersection curves of surfaces or the contour curves of surfaces. The nature of these curves are adequately discussed in the literature 1 and in a previous report.2 In order to convey a realistic impression of an object or an assembly of objects, the segments of lines which cannot be seen by an observer are not drawn or are drawn dashed. Without specification of visibility a drawing is ambiguous. This paper presents a recently developed scheme for the determination of visibility in a line drawing which enables comparitively high speed calculation and excellent resolution.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cited by
A head-mounted three dimensional display
Sutherland, I. E. (1968) · Proceedings of the December 9-11, 1968, fall joint computer conference, part I on - AFIPS '68 (Fall, part I) · doi:10.1145/1476589.1476686 · Cited by 2,065
Suggestive contours for conveying shape
DeCarlo, D., Finkelstein, A., Rusinkiewicz, S., & Santella, A. (2003) · ACM Transactions on Graphics · doi:10.1145/882262.882354 · Cited by 466
Metadata
- Authors
- Appel, A.
- Venue
- Proceedings of the 1967 22nd national conference on -
- Publisher
- ACM Press
- Published
- 1967
- Pages
- 387-393
- OpenAlex
- W2154841872
- Cited by
- 181
- References
- 0
- FWCI
- 6.00
- Type
- conference paper
- Language
- en
- Open access
- bronze
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: The notion of quantitative invisibility and the machine rendering of solids. https://app.cochat.ai/papers/10.1145/800196.806007
- The paper
- Appel, A. (1967). The notion of quantitative invisibility and the machine rendering of solids. Proceedings of the 1967 22nd national conference on -. https://doi.org/10.1145/800196.806007
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.