Colors on terrain, glcolorpointer ?

[artariel]

glcolorpointer doesn't work. i mean, it changes nothing on the tiles.. what is missing ?


init loop :

keslan[z * TERRAIN_SIZE + x].x=x - TERRAIN_SIZE/2;
			keslan[z * TERRAIN_SIZE + x].y=heightmap[z * TERRAIN_SIZE + x]  / SCALE_FACTOR ;
			keslan[z * TERRAIN_SIZE + x].z=z - TERRAIN_SIZE/2;
			keslan[z * TERRAIN_SIZE + x].u=(GLfloat)x/TERRAIN_SIZE*16;
			keslan[z * TERRAIN_SIZE + x].v=(GLfloat)z/TERRAIN_SIZE*16;
			keslan[z * TERRAIN_SIZE + x].r=0.5f + 0.5f * keslan[z * TERRAIN_SIZE + x].y / MAX_HEIGHT;
			keslan[z * TERRAIN_SIZE + x].g=0.5f + 0.5f * keslan[z * TERRAIN_SIZE + x].y / MAX_HEIGHT;
			keslan[z * TERRAIN_SIZE + x].b=0.5f + 0.5f * keslan[z * TERRAIN_SIZE + x].y / MAX_HEIGHT;
			keslan[z * TERRAIN_SIZE + x].a=1.0f;

draw code :

glBindBuffer(GL_ARRAY_BUFFER,m_vert);
	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_COLOR_ARRAY);
	glVertexPointer(3, GL_FLOAT, sizeof(vrt), NULL);
	glTexCoordPointer(2,GL_FLOAT,sizeof(vrt),(char*)NULL + 12);
	glColorPointer(4,GL_FLOAT,sizeof(vrt),(char*)NULL + 20);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,m_ind);
	glDrawElements(GL_TRIANGLE_STRIP,indices.size(),GL_UNSIGNED_INT,0);
	glBindBuffer(GL_ARRAY_BUFFER,0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);

[BionicBytes]

I can't see anything wrong with the array setup code.
How are you shading the terrain, where's the rest of the draw code and state?

[artariel]

void CGfxOpenGL::Render()
{
	glClearColor(0.0f, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
	glLoadIdentity();
	gluLookAt(cameraX, cameraY, cameraZ, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
 
 
	m_skybox.Render(cameraX, cameraY, cameraZ);
 
	DrawTerrain();
}

drawterrain is the above one

[Dan Bartlett]

Are you using shaders, or the fixed function? If you are using shaders you will need to use gl_Color for colors to have any effect.

[artariel]

shaders ? i don't think i use them. what do you mean by fixed function ?

[BionicBytes]

I think we need to see what's inside DrawTerrain();

[artariel]

void CGfxOpenGL::DrawTerrain()
{
	static float ze = 2.00f;
 
	glBindTexture(GL_TEXTURE_2D, m_grassTexture);
	//glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 
	glBindBuffer(GL_ARRAY_BUFFER,m_vert);
	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_COLOR_ARRAY);
	glVertexPointer(3, GL_FLOAT, sizeof(vrt), NULL);
	glTexCoordPointer(2,GL_FLOAT,sizeof(vrt),(char*)NULL + 12);
	glColorPointer(4,GL_FLOAT,sizeof(vrt),(char*)NULL + 20);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,m_ind);
	glDrawElements(GL_TRIANGLE_STRIP,indices.size(),GL_UNSIGNED_INT,0);
	glBindBuffer(GL_ARRAY_BUFFER,0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
 
 
 
	//water
	glBindTexture(GL_TEXTURE_2D, m_waterTexture);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
	glBegin(GL_QUADS);
		glTexCoord2f(0.0, 0.0);
		glVertex3f(-TERRAIN_SIZE/2.1f, WATER_HEIGHT, TERRAIN_SIZE/2.1f);
 
		glTexCoord2f(TERRAIN_SIZE/4.0f, 0.0);
		glVertex3f(TERRAIN_SIZE/2.1f, WATER_HEIGHT, TERRAIN_SIZE/2.1f);
 
		glTexCoord2f(TERRAIN_SIZE/4.0f, TERRAIN_SIZE/4.0f);
		glVertex3f(TERRAIN_SIZE/2.1f, WATER_HEIGHT, -TERRAIN_SIZE/2.1f);
 
		glTexCoord2f(0.0, TERRAIN_SIZE/4.0f);
		glVertex3f(-TERRAIN_SIZE/2.1f, WATER_HEIGHT, -TERRAIN_SIZE/2.1f);
	glEnd();
 
}

[BionicBytes]

Your Terrain render isn't doing anything with the colours in the vertex array because you have enabled texturing. What you need to do is combine the texture colour with the per-vertex colour.
This is usually done via glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, pname);
where pname is either GL_DECAL, GL_ADD, GL_MODULATE, GL_BLEND, GL_REPLACE or GL_COMBINE

Basic per-vertex colour * Texture colour is achieved via GL_MODULATE.

GL_COMBINE uses Texture Combiner Functions which has been superceeded by shaders which will allow you to perform a custom wizzy function on your terrain instead of some rather limited math.

Perhaps you have set the textEnv to GL_REPLACE elsewhere in your code which means the final colour is only the texture colour and the vertex colour is ingored.

[artariel]

thank you so much, it works now. I think i have to learn about textures more :P

[artariel]

Your Terrain render isn't doing anything with the colours in the vertex array because you have enabled texturing. What you need to do is combine the texture colour with the per-vertex colour.
This is usually done via glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, pname);
where pname is either GL_DECAL, GL_ADD, GL_MODULATE, GL_BLEND, GL_REPLACE or GL_COMBINE

Basic per-vertex colour * Texture colour is achieved via GL_MODULATE.

GL_COMBINE uses Texture Combiner Functions which has been superceeded by shaders which will allow you to perform a custom wizzy function on your terrain instead of some rather limited math.

Perhaps you have set the textEnv to GL_REPLACE elsewhere in your code which means the final colour is only the texture colour and the vertex colour is ingored.

by the way i have to ask

what is "normal" for a mesh/model ? i got texture coords, vertex, color thing but what is a normal ?