Method AddSphere

trinity/TriLineSet.cpp:77–143

}

void TriLineSet::AddSphere( const Vector3& center, float radius, int segments, uint32_t color )
{
	if( segments < 4 )
	{
		segments = 4;
	}

	if( segments % 2 == 1 )
	{
		++segments;
	}

	float step = ( XM_PI * 2.0f ) / (float)segments;
	float halfStep = step * 0.5f;

	float curRadius = 0.0f;
	float curY = 0.0f;
	for( int i = 0; i < segments; ++i )
	{
		float fi = (float)i;

		float nextRadius = sin( fi * halfStep ) * radius;
		float nextY = cos( fi * halfStep ) * radius;

		for( int j = 0; j < segments; ++j )
		{
			float t0 = (float)j * step;
			float x0 = sin( t0 ) * curRadius;
			float z0 = cos( t0 ) * curRadius;

			float t1 = t0 + step;
			float x1 = sin( t1 ) * curRadius;
			float z1 = cos( t1 ) * curRadius;

			Vector3 from;
			from.x = x0 + center.x;
			from.y = center.y - curY;
			from.z = z0 + center.z;

			Vector3 to;
			to.x = x1 + center.x;
			to.y = from.y;
			to.z = z1 + center.z;

			Add( from, color, to, color );

			Vector3 nextTo;
			nextTo.x = center.x + sin( t0 ) * nextRadius;
			nextTo.y = center.y - nextY;
			nextTo.z = center.z + cos( t0 ) * nextRadius;

			Add( from, color, nextTo, color );

			from.y = center.y + curY;
			to.y = from.y;

			Add( from, color, to, color );