Method AddCylinder

trinity/TriLineSet.cpp:145–223

}

void TriLineSet::AddCylinder( const Vector3& start, const Vector3& end, float radius, int segments, uint32_t color )
{
	Vector3 z = start - end;
	float length = Length( z );
	z /= length;

	Vector3 up( 0.0f, 1.0f, 0.0f );
	if( fabs( z.y ) > 0.99f )
	{
		up = Vector3( 1.0f, 0.0f, 0.0f );
	}

	Vector3 x = Normalize( Cross( up, z ) );

	Vector3 y = Cross( z, x );

	Matrix m;
	m._11 = x.x;
	m._12 = x.y;
	m._13 = x.z;
	m._14 = 0.0f;

	m._21 = y.x;
	m._22 = y.y;
	m._23 = y.z;
	m._24 = 0.0f;

	m._31 = z.x;
	m._32 = z.y;
	m._33 = z.z;
	m._34 = 0.0f;

	m._41 = end.x;
	m._42 = end.y;
	m._43 = end.z;
	m._44 = 1.0f;

	Matrix scale = ScalingMatrix( radius, radius, length );
	m = scale * m;

	if( segments < 4 )
	{
		segments = 4;
	}

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

	float step = ( XM_PI * 2.0f ) / (float)segments;
	for( int i = 0; i < segments; ++i )
	{
		float x = cosf( i * step );
		float y = sinf( i * step );

		Vector3 from( x, y, 0.0f );
		Vector3 to( x, y, 1.0f );