Shader tests

[pixie]

@hans:
psst! it's all fake nonetheless

[Hans]

Kram1032:
Oh, thanks. Your mention made it very easy for me to understand what the shaders is like and how I can use it.

pixie:

[Kram1032]

No problem.
Btw, the "procedural bump test"-scene show an example for an even more complex procedural map, which looks more realistic, as it doesn't use full circles but random lines... (based on a Brownian noise pattern, pulled to thin grooves...)

[cpfresh]

progress ... kind of? the grid is showing up but not exactly how i'd planned.

[Kram1032]

how did you plan it?

[crojack]

progress ... kind of? the grid is showing up but not exactly how i'd planned.

might not be as planned, but really cool looking nonetheless!

[cpfresh]

lol thanks crojack.

mark: the plan was a black grid on white but i think it's safe to say that i've got the colors quite mixed-up.

back to the drawing board?

[Kram1032]

just to the colour-part of the drawing board
Well, Just as crojack, I like it as is ^^
If you change it a bit to be yellow everywhere, it could be the perfect Holoroom^^

[crojack]

cpfresh: are you writing this code into skindigo or are you editing the actual text file?

[cpfresh]

crojack:
since there is currently no shader support in SkIndigo for the albedo property, i have been using the "linked igm" material type and editing the code in an igm file. i got the idea after using fused's checkerboard shader since it was the easiest way to get the code into the albedo entry in sketchy.

mark:
holoroom? /me runs off to google

[PureSpider]

Reminds me of Tron

[crojack]

I was thinking Tron also!

I just tried the linked IGM with the checkerboard, same as you, but no luck. I get an error asking for element shader or something like that.

[cpfresh]

crojack:
i forgot to mention you'll need to add another set of <shader> and </shader for the checkboard to work. sorry.

as far as further progress goes, ... peep the grid:

[cpfresh]

ok well i think im stuck on this shader as i cant seem to get the courses to alternate the offset. my code is below. the problem lies in not being able to use the odd() function as given by Ono. i'm using reals and the function wants ints. i tried a work around for this but never-the-less it remains in grid form and not a CMU pattern as i'd hoped. any comments or solutions are welcome. thanks

Code: Select all

            <albedo>
                <shader>
                    <shader>
                        <![CDATA[

                        def eval(vec3 pos) vec3 : 
                        vec3(
                             # this first if is to determine whether
                             # this is an odd or even course
                            if(
                                eq(
                                    mod( 
                                        sub(
                                            div(
                                                dotj(
                                                    getTexCoords(0)
                                                ),64.0
                                            ),
                                            mod(
                                                dotj(
                                                    getTexCoords(0)
                                                ),64.0
                                            )
                                         ),2.0
                                    ),0.0
                                ),

                                #this is one course configuration
                                if(
                                    and(
                                        gte(
                                            mod(
                                                doti(
                                                    getTexCoords(0)
                                                ),128.0
                                            ),
                                            div(
                                                125.0,128.0
                                            )
                                        ),
                                        gte(
                                            mod(
                                                dotj(
                                                    getTexCoords(0)
                                                ),64.0
                                            ),
                                            div(
                                                61.0,64.0
                                            )
                                        )
                                    ),1.0,0.0
                                ),

                                # this is the other course configuration
                                if(
                                    and(
                                        gte(
                                            mod(
                                                add(
                                                    doti(
                                                        getTexCoords(0)
                                                    ),64.0
                                                ),128.0
                                            ),
                                            div(
                                                125.0,128.0
                                            )
                                        ),	
                                        gte(
                                            mod(
                                                dotj(
                                                    getTexCoords(0)
                                                ),64.0
                                            ),
                                            div(
                                                61.0,63.0
                                            )
                                        )
                                    ),1.0,0.0
                                )
                            )
                        )
                      ]]>
                    </shader>
               </shader>

i've used the 64 (8x8) and 128 (16x8) as the dimensions of my cmu blocks -- broken down into 1/8ths of an inch. i did this so the lines would be the width of the mortar joint (3/8")

[Kram1032]

Sorry, meant "holodeck" I didn't know, it's "deck" in english, too, so I hoped I'd hit the word with "room"^^
http://en.wikipedia.org/wiki/Holodeck

to get ints from reals, use floor(real+0,5) (or alternatively, ceil(real-0,5))

I wish I could see this with simple calc-signs.... As it is here, it looks pretty confusing, somehow....