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Arthur Spooner

Paint SOP - First time

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First time I've used Paint SOP.  

I've applied a constant shader to the object but I can't paint on the mesh, I read the instructions in the documentation a few times, the brush is working reading to paint, visually I don't see anything in the viewport ?

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hi,

to use the paint sop, you need uv on your geo.   (*edit* actually it works without the uvs. sorry : /  (since it's painting points))

geo -> uv project -> paint sop

paint sop will colour the POINTS, so it will be dependant of the resolution of you geo.

 

here a little hip exemple (very basic on a grid)

od_paintSOP.hipnc

Edited by 6ril

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Guest tar

Riddle this: render it and then look at you geometry spreadsheet for the Cd values. Hint: the geometry spreadsheet is your number one resource in Houdini to understanding.

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30 minutes ago, marty said:

Riddle this: render it and then look at you geometry spreadsheet for the Cd values. Hint: the geometry spreadsheet is your number one resource in Houdini to understanding.

I understand I must override the color ? 

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Guest tar
18 minutes ago, Arthur Spooner said:

I understand I must override the color ? 

Can you show numerically how this would help please. Thanks!

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That is my guess, I'm probably wrong but Cd.r = value ? That is what I guessed when looking in the Spreadsheet on Cd as to why I don't see anything in the viewport ? 

Edited by Arthur Spooner

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Guest tar

What is the range of values for r,g,b from the colour black to white? Then look at the spreadsheet and see what values the Cd attributes are set to.

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The range for in the spread sheet for rgb is 1.8 to 1.0 (rgb) I entered the value for visualize attribute range 1.8 to 1.0, hoping that is what you mean ? :unsure:

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Guest tar

No that isn't the correct answer. You seem to be missing elementary computer graphics knowledge, therefore you will be confused by everything. Please google the following:

Tell us what the colour black is in R,G,B values?

Tell us what the colour white is in R,G,B? values?

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Guest tar

No -we don't use 8bit colour. Again in float values please.

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Guest tar

Correct - now you know this, go back though your questions and see why if the RGB attribute values, when they are over value of 1, which means white, don't show in the viewport.

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I thought my answer was to apply a constant shader to the mesh, make it a color other then blue and then I would see the white I'm painting, instead my answer was wrong ? :unsure:

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Guest tar

Well, painting blue works whether you add a shader or not. So looking at the spreadsheet again please read the values of the 'blue' colour.

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9 hours ago, marty said:

Well, painting blue works whether you add a shader or not. So looking at the spreadsheet again please read the values of the 'blue' colour.

Blue is 1.0. :unsure:

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Guest tar
5 hours ago, Arthur Spooner said:

Blue is 1.0. :unsure:

I'm confused by your confusion. Have you used any computer painting software before? PaintSop works just like Photoshop or MSPaint. 

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