Thread: terrain collision

ok....Iv'e looked at what you posted, and tried to figure it out, without much luck...I did however look at the heightmap tutorial on gametutorials.com, and applied their collision code to mine, but its not working:

Geometry.cpp (snippet):

Code:

const char heightmapFilename[] = "Terrains\\heightmap.raw";

const float MAX_HEIGHT = 30.0f;
const float SCALE_FACTOR = 256.0f / MAX_HEIGHT;

int Height(BYTE *pHeightMap, int X, int Y)
{
	// Make sure we don't go past our array size
	int x = X % TERRAIN_SIZE;					// Error check our x value
	int y = Y % TERRAIN_SIZE;					// Error check our y value

	if(!pHeightMap) return 0;				// Make sure our data is valid

	// Use the equation: index = (x + (y * arrayWidth) ) to find the current height
	return pHeightMap[x + (y * TERRAIN_SIZE)];	// Index into our height array and return the height
}

void DrawTerrain(int DrawWater)
{
	glActiveTextureARB		= (PFNGLACTIVETEXTUREARBPROC)		wglGetProcAddress("glActiveTextureARB");
	glMultiTexCoord2fARB	= (PFNGLMULTITEXCOORD2FARBPROC)		wglGetProcAddress("glMultiTexCoord2fARB");
	
	FILE *pFile = fopen(heightmapFilename, "rb");
	
	fread(&heightmap, TERRAIN_SIZE * TERRAIN_SIZE, 1, pFile);
	fclose(pFile);
	
	for (int z = 0; z < TERRAIN_SIZE - 1; ++z)
	{
		glActiveTextureARB(GL_TEXTURE0_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,  g_Texture[14]);
		glActiveTextureARB(GL_TEXTURE1_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,  g_Texture[2]);
		glActiveTextureARB(GL_TEXTURE2_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,  g_Texture[0]);
		glBegin(GL_TRIANGLE_STRIP);
		for (int x = 0; x < TERRAIN_SIZE; ++x)
		{
			// render two vertices of the strip at once
			float scaledHeight = heightmap[z * TERRAIN_SIZE + x] / SCALE_FACTOR;
			float nextScaledHeight = heightmap[(z + 1)* TERRAIN_SIZE + x] / SCALE_FACTOR;
			float color = 0.5f + 0.5f * scaledHeight / MAX_HEIGHT;
			float nextColor = 0.5f + 0.5f * nextScaledHeight / MAX_HEIGHT;
			
			glColor3f(color, color, color);
			glTexCoord2f((GLfloat)x/TERRAIN_SIZE*8, (GLfloat)z/TERRAIN_SIZE*8);
			glVertex3f(static_cast<GLfloat>(x - TERRAIN_SIZE/2), scaledHeight, static_cast<GLfloat>(z - TERRAIN_SIZE/2));
			
			glColor3f(nextColor, nextColor, nextColor);
			glTexCoord2f((GLfloat)x/TERRAIN_SIZE*8, (GLfloat)(z+1)/TERRAIN_SIZE*8);
			glVertex3f(static_cast<GLfloat>(x - TERRAIN_SIZE/2), nextScaledHeight, static_cast<GLfloat>(z + 1 - TERRAIN_SIZE/2));	
		}
		glEnd();
	}
	
	if(DrawWater == 1)
	{
		glColor4f(0.9f, 0.9f, 0.9f, 0.15f);
		glEnable(GL_BLEND);	
		glBlendFunc(GL_ONE, GL_ONE);
		glActiveTextureARB(GL_TEXTURE0_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,  g_Texture[18]);
		glActiveTextureARB(GL_TEXTURE1_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,  g_Texture[0]);
		glActiveTextureARB(GL_TEXTURE2_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,  g_Texture[0]);
		glBegin(GL_QUADS);
		glTexCoord2f(-40.0, 0.0);glVertex3f(-SEA_SIZE / 2, SEA_LEVEL, SEA_SIZE / 2);
		glTexCoord2f(-40.0, 40.0);glVertex3f(-SEA_SIZE / 2, SEA_LEVEL, -SEA_SIZE / 2);
		glTexCoord2f(40.0, 40.0);glVertex3f(SEA_SIZE / 2, SEA_LEVEL, -SEA_SIZE / 2);
		glTexCoord2f(40.0, 0.0);glVertex3f(SEA_SIZE / 2, SEA_LEVEL, SEA_SIZE / 2);
		glEnd();
		glDisable(GL_BLEND);
	}
	
	CVector3 currentPos = g_Camera.Position();
	CVector3 newPos = currentPos;
	if (currentPos.y < Height(g_HeightMap, currentPos.x, currentPos.y) + 10)
	{
		newPos.y = (float)Height(g_HeightMap, currentPos.x, currentPos.y)  + 10;
		float temp = newPos.y - currentPos.y;
		CVector3 vView = g_Camera.View();
		vView.y += temp;
			
		g_Camera.PositionCamera(newPos.x, newPos.y, newPos.z,
			vView.x, vView.y, vView.z,
			0, 1, 0);
	}
}

Terrain.h:

Code:

const int TERRAIN_SIZE = 260;
GLubyte g_HeightMap[TERRAIN_SIZE*TERRAIN_SIZE];
GLubyte heightmap[TERRAIN_SIZE * TERRAIN_SIZE];
void DrawTerrain();

all help will be appreciated

-psychopath