2 replies to this topic

[vikku_]

Am new to OpenGL. Is it possible to wrap a single image on a terrain?

The below code would generate image tile , but I want to add single tile on entire terrain.

glBindTexture(GL_TEXTURE_2D, land);for (int z = 0; z < MAP_Z-1; z++){    glBegin(GL_TRIANGLE_STRIP);    for (int x = 0; x < MAP_X-1; x++)    {    glTexCoord2f(0.0f, 0.0f);    glVertex3f(terrain[x][z][0], terrain[x][z][1], terrain[x][z][2]);    glTexCoord2f(1.0f, 0.0f);    glVertex3f(terrain[x+1][z][0], terrain[x+1][z][1], terrain[x+1][z][2]);        glTexCoord2f(0.0f, 1.0f);    glVertex3f(terrain[x][z+1][0], terrain[x][z+1][1], terrain[x][z+1][2]);        glTexCoord2f(1.0f, 1.0f);        glVertex3f(terrain[x+1][z+1][0], terrain[x+1][z+1][1], terrain[x+1][z+1][2]);    }    glEnd();}

[dpadam450]

Well your code is assigning a tile to each quad, what do you expect?

//you can swap z and x here, doesn't matter that much.
glTexCoord2f(float(z)/float(MAP_Z), float(x)/float(MAP_X));

If z loops up to MAP_Z, then z/MAP_Z = 1
if z is halfway to MAP_Z, then z/MAP_Z = .5
if z = 0, then z/MAP_Z = 0

So they start at 0 for the first vertex, and then at the last one they are 1. Everything in between is then scaled accordingly.

[vikku_]

Well your code is assigning a tile to each quad, what do you expect?

//you can swap z and x here, doesn't matter that much.
glTexCoord2f(float(z)/float(MAP_Z), float(x)/float(MAP_X));

If z loops up to MAP_Z, then z/MAP_Z = 1
if z is halfway to MAP_Z, then z/MAP_Z = .5
if z = 0, then z/MAP_Z = 0

So they start at 0 for the first vertex, and then at the last one they are 1. Everything in between is then scaled accordingly.

Thank you it worked..