Search Results
Post Author Forum Replies Views Posted [asc]
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

When designing a texture for an arbitrary part, what's more likely? That you'll find at least one point on the part where the texture will tolerate some distortion and discontinuity, or that you'll f...
Benjamin Moody Parts Authoring 33 36,947 2014-08-22, 4:46
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

Quite. Only it's worse than that; ideally we would want a mapping that allows coordinates to be interpolated *linearly*, which is possible for at most half the sphere if your texture is infinitely la...
Benjamin Moody Parts Authoring 33 36,947 2014-08-22, 4:28
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

As I've thought about this more I've realized that I'm being silly. There is no way to map a sphere to a single linear texture without some discontinuities. But a renderer that cares about getting i...
Benjamin Moody Parts Authoring 33 36,947 2014-08-17, 16:58
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

Longitude + latitude is not a good solution because I don't think there's any way to make the poles seamless while using linearly interpolated texture coordinates. You could try including a mirrored ...
Benjamin Moody Parts Authoring 33 36,947 2014-08-16, 23:38
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

For |a| < 360 my implementation simply pads the texture out (with alpha = 0) to the equivalent of 360 degrees. For |a| < 180 this isn't necessary since you can just use clamping mode, but I haven't m...
Benjamin Moody Parts Authoring 33 36,947 2014-08-16, 19:33
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

From my perspective, one of the great things about the TEXMAP extension is that it allows users - who may or may not be experienced part authors - to create custom stickers / printed parts without mod...
Benjamin Moody Parts Authoring 33 36,947 2014-08-13, 3:27
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

Regarding "overscan", by which I guess you mean what happens to polygons, or parts of polygons, that fall outside the boundaries of the texture: You're right, although I didn't realize it, that the s...
Benjamin Moody Parts Authoring 33 36,947 2014-08-11, 5:19
    Thread: TEXMAP extension thoughts and findings.
Post: Re: TEXMAP extension thoughts and findings.

You're right. The spec is indeed self-contradictory regarding the orientation of cylindrical textures. My intuition was the opposite of yours; it seems more parsimonious that the first control point...
Benjamin Moody Parts Authoring 33 36,947 2014-08-11, 3:33