pouët.net

thx Las - I just tried the ray warp with your setup - it kinda works :P

http://glsl.heroku.com/e#4008.0

This old one is similar http://glsl.heroku.com/e#865
Using the sandbox http://glsl.heroku.com/e#4016.0

But it's not the same effect, because the cubes in texas, are also tilted with the wave normal.

That's more hard to do in raymarching because the symmetryis are not regular like in a checkboard.

Cool thx !




That's why you need to modify the ray "in flight" this gives the correct warp so the cubes tilt'n'stuff.

Just need to sort out the errors when stepping from one rep domain to another with a different height - I guess u can predict the step size to take based on the Height mod function you use.

well - modifying the ray "in flight" will give you horrible artifacts :)

It does indeed :) I have no Idea what that is - maybe it's a distance traveled error or something - maybe you calc the correct distance with some fake integration shenanigans.

I can't look at shaders/raymarching... it's just so addictive LOL
Another shader, based on the last ones... :)
Tile Waves

Considering modifying in flight: as long as your ray follows certain curve (not dependent on sampled distance values), it should be OK as long as in each iteration you don't move further away from sampled position as the returned safe distance.

Well, that's boring than.

Boring, yet fun: http://glsl.heroku.com/e#4022.1

that one dependent on the sampled distance but works out quite well, hmm. ;)

the problem with raymarching is that I should use nvidia chipset instead of my quiet intel integrated. this means huge fan sounds from my computer and moreover, it will never works on all platforms.

If you happen to prefer intel's gl implementation over nvidia's, then i'm at a loss of words.

shaders are not uniforms ! did you know I was the great inventor brain for shaders ? when everybody used graphic cards to make 3d, I was finnishing my own engine that is 8500 polys in 70% of vertical blank on P133 animated and shadowed stuff. it was incredible the time I've spent to make software shaders to get this particular stuffs, and I was looking for automatise my routines. It's because we invent too clear type for windows in Huge Crowd. those people recognize themselves as amateurs, as directx8 and directx9 camera matrix was corrected by my care. at now, I've developped unusefull tools and games and libraries to make cross platform games and I'm threaten like an alienate by people here that feel strange with huge sound of the daemon. well, microsoft is the bullshit and my fingers make it possible. do you understand I use computers now like everybody people who buy software, computers without the understandings of maths ?
It's reality that I say, and when I'm getting injured by rez like if I was an alienate or a criminal, I'm very disappointed, and it makes different version of shaders.

I've studied the matrix gram-schmidt orthonormalisation in "prepa" before ingeneer school.

let's say people here are really silly ones !

i'd say we all have studied gram-schmidt orthogonalization of matrices at school, (two years) before university....

i'm answering this part of your comments because it's the only part i understand from it :)

What iq said follow by WTF!!!

drop those pills, Bartoshe, they are making you brain-dead. For real.

Bartoshe I didn't see a way to msg you directly:
But please read what you write before posting.
Or maybe wirte in French and use Google translate ?

You come out as lunatic and are just polluting this thread with drivel.

If you are frustrated because you cant see or write ray-marching code because you cant stand the noise of an nvidia card? yes?
Then you should look at 28nm fanless models and explore/apply your mathematical knowledge without any fan noise.

BTW, you can write this type of stuff on the CPU... but I'm afraid you CPU will heat up and the fan will spin.

just learned how to raymarch in a couple hours, here are pics of my progress from not knowing shit about what to do.. to a simple raymarched cube






i might put my 3d julia set in a raymarcher next..

for beginners, here is my shader code for example purposes:

i tried to generate my own rotation matrix to pass to the fragment shader but failed miserably lol.. anyone know what was wrong with it?

SiliconLife - well done - but the stringify macro is your friend!


#define STRINGIFY(x) #x

char* vs=STRINGIFY(
...
shader code without quotes
...
);

and here's my rot mat funk that I pass to gl via a mat4 uniform - which works a treat:
where glRotatMat has already been filled with Identity:

float glIdentMat[16]={1,0,0,0, 0,1,0,0, 0,0,1,0 ,0,0,0,1};

void glesRotatef( float a, float x,float y, float z)
{
float angle=a*PI_OVER_180;
glRotatMat[0] = 1+(1-cos(angle))*(x*x-1);
glRotatMat[1] = -z*sin(angle)+(1-cos(angle))*x*y;
glRotatMat[2] = y*sin(angle)+(1-cos(angle))*x*z;
glRotatMat[4] = z*sin(angle)+(1-cos(angle))*x*y;
glRotatMat[5] = 1+(1-cos(angle))*(y*y-1);
glRotatMat[6] = -x*sin(angle)+(1-cos(angle))*y*z;
glRotatMat[8] = -y*sin(angle)+(1-cos(angle))*x*z;
glRotatMat[9] = x*sin(angle)+(1-cos(angle))*y*z;
glRotatMat[10] = 1+(1-cos(angle))*(z*z-1);
glesMultMatrix(GL_MODELVIEWMAT,glRotatMat);
gMatrixChanged=true;
}

T21: don't argue with a crazy person. :)