Paint SOP - First time

[Arthur Spooner 0]

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 ?

[6ril 83]

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 May 7, 2016 by 6ril

[Arthur Spooner 0]

ok

Edited May 7, 2016 by Arthur Spooner

[Arthur Spooner 0]

My paint sop scene, paint doesn't work ?

as_paint_prob.hipnc

[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.

[Arthur Spooner 0]

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 ? 

[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!

[Arthur Spooner 0]

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 May 8, 2016 by Arthur Spooner

[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.

[Arthur Spooner 0]

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 ? 

[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?

[Arthur Spooner 0]

Black is 0,0,0 and white is 255*3 !

[Guest tar]

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

[Arthur Spooner 0]

I've read enough on this, I should know it !

0 is black, and 1 is white.

[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.

[Arthur Spooner 0]

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 ? 

[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.

[6ril 83]

aouch!

[Arthur Spooner 0]

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. 

[Guest tar]

5 hours ago, Arthur Spooner said:

Blue is 1.0. 

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