Heightmap and Textures

Question

Im trying to find the "best way" to apply a texture to a heightmap with opengl 3.x.

Its really hard to find something on google because tutorials are olds and they're all using different methods, im really lost and i dont know what to use at all.

Here is my code that generates the heightmap (its basic)

    float[] vertexes = null;
    float[] textureCoords = null;

    for(int x = 0; x < this.m_size.width; x++)
    {
        for(int y = 0; y < this.m_size.height; y++)
        {
            vertexes ~= [x, 1.0f, y];
            textureCoords ~= [cast(float)x / 50, cast(float)y / 50];
        }
    }

As you can see, i dont know how to apply the texture at all (i was using / 50 for my tests).

Result of that code :

I would like to have something very basic like :

(you can find more pics in his blog)

Edit : my texture size is 1024x1024.

Answer 1

Basicly it's all the same method.

You have a texture at the same size of your grid. lets go with your 1024x1024. that would be ideal to have a grid that is 1024 x 1024 then.

The first thing you do is to get a pointer or some access to the texture, so you can iterate over it.

The second thing you do is to have access to the vertex buffer. from there you iterate all of the vertices and give them values corresponding to the texture.

So, lets say this:

For x < 1024; ++x
for y < 1204; ++y
vertex[ y * 1024 + x ] = float4( x, textureArray[ y * 1024 + x].value, y );

This is the most simplest way i can explain this to you. but that is the basic idea. and the code will go thrue all the vertices and find the exact same pixel from the texture.

And from there you can add spacing, and what ever you want!