Hello, everyone. Lately I’ve been casually working through Daniel Shiffman’s book Learning Processing, to better familiarize myself with Processing. I was working on exercise 14-5 in the book: “Create a three-dimensional cube using eight quads — beginShape(QUADS)”. My idea was to create a quad in…

I see now that it draws two quad regardless of push/popMatrix(), but they were drawn at the same location, so I didn’t see. beginShape(QUADS); translate(0, 0, -D); quad(-D, -D, D, -D, D, D, -D, D); translate(0, 0, 2*D); endShape(); But if I do this, still two quads get drawn, even…

Hello, Welcome. Try translating only the shape: pushMatrix(); translate(0, 0, -D); beginShape(QUAD); quad(-D, -D, D, -D, D, D, -D, D); endShape(); popMatrix(); :)

Hello, thanks for the quick response! This does work. But should I then use a new begin/endShape(), for every side of the cube? Like this?: pushMatrix(); translate(0, 0, -D); beginShape(QUAD); quad(-D, -D, D, -D, D, D, -D, D); endShape(); popMatrix(); pushMatrix(); translate(0, 0…

There is a discussion here about this: [image] Transformations issues Coding Questions It isn’t quite that it ignores them entirely. It is that the coordinate space for the vertex data is based on the transformation matrix when you write “beginShape().” If you want a toru…

Because then it seems quicker to just not use push/popMatrix() and just translate back after each quad.

Okay, thank you, I will read through it!

Hello, https://processing.org/examples/rgbcube.html This example and others are also in the Processing PDE in the files menu; not on the site but should be. Some insights here as well for grouping shapes: https://processing.org/tutorials/pshape/ :)

I did see that is most examples they used vertex() instead of quad(). Is there a specific reason for that?

[image] theqxy: Is there a specific reason for that? Explore the references, examples and tutorials. vertex() / Reference / Processing.org quad() / Reference / Processing.org PShape / Processing.org :)

[image] theqxy: I did see that is most examples they used vertex() instead of quad(). Is there a specific reason for that? In general vertex is more flexible. You can have 3, 4, 5, 6, or 100 points, whereas quad has four. Also, if you are having many tiles – like a quad strip – then you can d…

Quad() gets drawn twice

Processing Coding Questions

glv October 6, 2020, 11:14am 5

There is a discussion here about this:

:)

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Quad() gets drawn twice

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