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ligthing problem

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ive been working on a algortitm or how u call it for terrain lighting... im not to advanced on eithermath, physics nor programming but ive come up with this code... bool dark; int x, z, p; // x pos on height map, z pos on height map, x pos from x to sunx float pHeight, mHeight; // height of ray, heightmap int sunX = m_iSize*2, sunY = m_iSize; // sun pos varibles //loop through all vertices for( z=0; z < m_iSize; z++ ) // m_iSize is the size of the heighmap { for( x = -m_iSize; x < sunX; x++ ) { dark = false; for (p = m_iSize ;0 < p; p--){ mHeight = GetScaledHeightAtPoint(p, z); pHeight = float( tan(((sunY-mHeight) / (sunX - x)) * (p - x)) ); if (pHeight < mHeight){ dark = true; } if (dark == true && mHeight < pHeight){ SetBrightnessAtPoint( p, z, (unsigned char)(pHeight-mHeight) ); } } } } the results get rly wierd and i cant seem to find why... anyone have any suggestions or should i give up?

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