This maybe very silly or beginner's question.

However, please someone answer this question so I can go on.

I took workshop hosted by Wesley Smith in Korea, read Andrew Benson's 'your first shader', and checked 'jitter-shaders' in max5 folder.

I encountered a problem when I tried to implement the first shader in orange book into jitter.

I never saw variables attribute used in previous reading.

I read over and over but I can't fully understand how attribute works.

--------------------------------------------------------

Temperature = (VertexTemp - CoolestTemp) / TempRange;

gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

vec3 color = mix(CoolestColor, HottestColor, Temperature);

---------------------------------------------

How can I implement attribute variable into jitter way?

I checked the post Wes uploaded a while ago.

https://cycling74.com/forums/index.php?t=msg&goto=78187&rid=5580&S=1863eae0d9d8795fe88748e5124adcd1&srch=attribute+variables#msg_78187

I changed the 3 values for 'p Displace', nothing happened.

This maybe very silly or beginner's question.
However, please someone answer this question so I can go on.

I just started to dig into glsl.
I took workshop hosted by Wesley Smith in Korea, read Andrew Benson's 'your first shader', and checked 'jitter-shaders' in max5 folder.
And finally started to read orange book.

I encountered a problem when I tried to implement the first shader in orange book into jitter.
I never saw variables attribute used in previous reading.
I'm stuck.
I read over and over but I can't fully understand how attribute works. 

first shader in orange book
--------------------------------------------------------
//vertex part
uniform float CoolestTemp;
uniform float TempRange;

void main()
{
    Temperature = (VertexTemp - CoolestTemp) / TempRange;

    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}

//fragment part
uniform vec3 CoolestColor;
uniform vec3 HottestColor;

void main()
{
    vec3 color = mix(CoolestColor, HottestColor, Temperature);

    gl_FragColor = vec4(color, 1.0);
}
---------------------------------------------

I checked the post Wes uploaded a while ago.https://cycling74.com/forums/index.php?t=msg&goto=78187&rid=5580&S=1863eae0d9d8795fe88748e5124adcd1&srch=attribute+variables#msg_78187
I changed the 3 values for 'p Displace', nothing happened.

attribute-variables-in-glsl

http://www.mat.ucsb.edu/~whsmith/vertex_attr.zip

Wes, can you upload the file again?
The link is broken.
It must help.http://www.mat.ucsb.edu/~whsmith/vertex_attr.zip


a quick search for vertex attributes reveals this post as the top match:

https://cycling74.com/forums/index.php?t=msg&goto=163219&rid=3061

a quick search for vertex attributes reveals this post as the top match:https://cycling74.com/forums/index.php?t=msg&goto=163219&rid=3061


I checked that before and didn't understand fully.

I'm checking 'v001.rutt-etra' patch right now.

I maybe asking too much for the level of my knowledge.....sad..

I just skip for now and go on for next one.

Thanks.
I checked that before and didn't understand fully.
I'm checking 'v001.rutt-etra' patch right now.

I just skip for now and go on for next one.
However, I'll come back on this.


Attribute variables in GLSL