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I am creating some 2d technical drawings, is there a standard way to shade/hatch a curved surface?enter image description here

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As @Billy Kerr 's linked document correctly shows, in a section view, the area hatched is only the portion of the object directly sliced by the section plane.

In some section drawings, one may choose to also use shading to indicate form, if the view ends up confusing and the object forms are complex; in those cases, great care must be taken to clearly differentiate the cut poché from the surface shading to avoid any confusion - this is why in most simple technical drawing sections, the illustrator chooses to eschew surface shading completely - for simplicity and clarity.

In architectural sections, sometimes we keep the surface shading to help clear form reading - I did that in this perspective section of a sub-assembly of a complex interior door - though for this example the sectioned area doesn't have a hatch, it has a poché, which indicates it having been sectioned, but not any specific materiality:

enter image description here

But more typically in architectural sections we only hatch cut areas, and avoid surface shading, and if a section is not schematic, we show the hatch for the relevant sectioned material, just as is common in other technical drawing typologies:

enter image description here

Here's a super-quick example (at client's site w/ none of my typical CAD tools - this was Affinity Designer running fast and loose) to show conceptual relationships:

enter image description here

Hope that helps.

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  • That's great. I was curious, because I don't remember learning anything about it, but have seen technical drawings with various different gradient hatching denoting curves. I like the concept of the last image above. I may incorporate that into my work.
    – Aasim Azam
    Jul 22, 2019 at 10:25

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