void GetRequiredBlocks(BlockPosition worldBlockPosition)
{
// We're putting in some work here to try to avoid loading the same blocks
// multiple times for various faces of the block we're working on. This
// is only useful for blocks where we're drawing multiple faces, which isn't
// many of them relatively speaking. It's just barely worth the complexity.
// TODO: depending on how things work out, it might be better to just do a
// marching load of blocks along the z axis. That would be 9 blocks loaded
// per tessellation, and we're currently doing ~7, but that could change as
// we mess with the terrain and algorithms.
// TODO: We can save a little time by getting the world
// positions by relative arithmetic rather than direction chains.
upBlock = world.GetBlockAt(worldBlockPosition.Up);
if (upBlock.CanBeSeenThrough)
{
upFrontBlock = world.GetBlockAt(worldBlockPosition.Up.Front);
upBackBlock = world.GetBlockAt(worldBlockPosition.Up.Back);
upLeftFrontBlock = world.GetBlockAt(worldBlockPosition.Up.Left.Front);
upLeftBlock = world.GetBlockAt(worldBlockPosition.Up.Left);
upLeftBackBlock = world.GetBlockAt(worldBlockPosition.Up.Left.Back);
upRightFrontBlock = world.GetBlockAt(worldBlockPosition.Up.Right.Front);
upRightBlock = world.GetBlockAt(worldBlockPosition.Up.Right);
upRightBackBlock = world.GetBlockAt(worldBlockPosition.Up.Right.Back);
}
else
{
upLeftBlock = null;
upBackBlock = null;
upLeftBackBlock = null;
upRightBlock = null;
upRightBackBlock = null;
upFrontBlock = null;
upRightFrontBlock = null;
upLeftFrontBlock = null;
}
leftBlock = world.GetBlockAt(worldBlockPosition.Left);
if (leftBlock.CanBeSeenThrough)
{
leftFrontBlock = world.GetBlockAt(worldBlockPosition.Left.Front);
leftBackBlock = world.GetBlockAt(worldBlockPosition.Left.Back);
leftUpFrontBlock = upLeftFrontBlock ?? world.GetBlockAt(worldBlockPosition.Left.Up.Front);
leftUpBlock = upLeftBlock ?? world.GetBlockAt(worldBlockPosition.Left.Up);
leftUpBackBlock = upLeftBackBlock ?? world.GetBlockAt(worldBlockPosition.Left.Up.Back);
leftDownFrontBlock = world.GetBlockAt(worldBlockPosition.Left.Down.Front);
leftDownBlock = world.GetBlockAt(worldBlockPosition.Left.Down);
leftDownBackBlock = world.GetBlockAt(worldBlockPosition.Left.Down.Back);
}
else
{
leftUpBlock = null;
leftBackBlock = null;
leftUpBackBlock = null;
leftFrontBlock = null;
leftUpFrontBlock = null;
leftDownBlock = null;
leftDownFrontBlock = null;
leftDownBackBlock = null;
}
rightBlock = world.GetBlockAt(worldBlockPosition.Right);
if (rightBlock.CanBeSeenThrough)
{
rightFrontBlock = world.GetBlockAt(worldBlockPosition.Right.Front);
rightBackBlock = world.GetBlockAt(worldBlockPosition.Right.Back);
rightUpFrontBlock = upRightFrontBlock ?? world.GetBlockAt(worldBlockPosition.Right.Up.Front);
rightUpBlock = upRightBlock ?? world.GetBlockAt(worldBlockPosition.Right.Up);
rightUpBackBlock = upRightBackBlock ?? world.GetBlockAt(worldBlockPosition.Right.Up.Back);
rightDownFrontBlock = world.GetBlockAt(worldBlockPosition.Right.Down.Front);
rightDownBlock = world.GetBlockAt(worldBlockPosition.Right.Down);
rightDownBackBlock = world.GetBlockAt(worldBlockPosition.Right.Down.Back);
}
else
{
rightUpBlock = null;
rightFrontBlock = null;
rightUpFrontBlock = null;
rightBackBlock = null;
rightUpBackBlock = null;
rightDownBlock = null;
rightDownBackBlock = null;
rightDownFrontBlock = null;
}
backBlock = world.GetBlockAt(worldBlockPosition.Back);
if (backBlock.CanBeSeenThrough)
{
backLeftBlock = leftBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Left);
backRightBlock = rightBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Right);
backUpLeftBlock = upLeftBackBlock ?? leftUpBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Up.Left);
backUpBlock = upBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Up);
backUpRightBlock = upRightBackBlock ?? rightUpBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Up.Right);
backDownLeftBlock = leftDownBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Down.Left);
backDownBlock = world.GetBlockAt(worldBlockPosition.Back.Down);
backDownRightBlock = rightDownBackBlock ?? world.GetBlockAt(worldBlockPosition.Back.Down.Right);
}
else
{
backUpBlock = null;
backRightBlock = null;
backUpRightBlock = null;
backLeftBlock = null;
backUpLeftBlock = null;
backDownBlock = null;
backDownLeftBlock = null;
backDownRightBlock = null;
}
frontBlock = world.GetBlockAt(worldBlockPosition.Front);
if (frontBlock.CanBeSeenThrough)
{
frontLeftBlock = leftFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Left);
frontRightBlock = rightFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Right);
frontUpLeftBlock = upLeftFrontBlock ?? leftUpFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Up.Left);
frontUpBlock = upFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Up);
frontUpRightBlock = upRightFrontBlock ?? rightUpFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Up.Right);
frontDownLeftBlock = leftDownFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Down.Left);
frontDownBlock = world.GetBlockAt(worldBlockPosition.Front.Down);
frontDownRightBlock = rightDownFrontBlock ?? world.GetBlockAt(worldBlockPosition.Front.Down.Right);
}
else
{
frontUpBlock = null;
frontLeftBlock = null;
frontUpLeftBlock = null;
frontRightBlock = null;
frontUpRightBlock = null;
frontDownBlock = null;
frontDownRightBlock = null;
frontDownLeftBlock = null;
}
downBlock = world.GetBlockAt(worldBlockPosition.Down);
if (downBlock.CanBeSeenThrough)
{
downFrontBlock = frontDownBlock ?? world.GetBlockAt(worldBlockPosition.Down.Front);
downBackBlock = backDownBlock ?? world.GetBlockAt(worldBlockPosition.Down.Back);
downLeftFrontBlock = leftDownFrontBlock ?? frontDownLeftBlock ?? world.GetBlockAt(worldBlockPosition.Down.Left.Front);
downLeftBlock = leftDownBlock ?? world.GetBlockAt(worldBlockPosition.Down.Left);
downLeftBackBlock = leftDownBackBlock ?? backDownLeftBlock ?? world.GetBlockAt(worldBlockPosition.Down.Left.Back);
downRightFrontBlock = rightDownFrontBlock ?? frontDownRightBlock ?? world.GetBlockAt(worldBlockPosition.Down.Right.Front);
downRightBlock = rightDownBlock ?? world.GetBlockAt(worldBlockPosition.Down.Right);
downRightBackBlock = rightDownBackBlock ?? backDownRightBlock ?? world.GetBlockAt(worldBlockPosition.Down.Right.Back);
}
// Don't need to null these out because they're not used anywhere else
}
Vector3 AverageLightingOver(Block adjacent, Block edge1, Block edge2, Block diagonal, float limit)
{
// For each vertex we examine four voxels grouped around the vertex in the plane of the face that the vertex belongs to.
// The voxels we're interested in for a particular vertex are:
// The voxel adjacent to the face we're calculating
// One voxel along the edge of the face we're calculating
// The other voxel along the edge of the face we're calculating
// The voxel diagonal to the face we're calculating
float average;
if (!edge1.CanPropagateLight && !edge2.CanPropagateLight)
{
// If the two edge voxels are not transparent then light can't get from the diagonal to the vertex we're calculating
// so we don't include it in the average
average = (adjacent.LightLevel + edge1.LightLevel + edge2.LightLevel) / 3f;
}
else
{
average = (adjacent.LightLevel + edge1.LightLevel + edge2.LightLevel + diagonal.LightLevel) / 4f;
}
var percentage = Math.Min(average / World.MaximumLightLevel, limit);
return new Vector3(percentage);
}
