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FIxed floating isle generation at chunk boundaries 

A mapgen fix authored by paramat, as mentioned here: https://github.com/minetest/minetest/issues/989
This commit is contained in:
0gb.us 2013-11-09 17:37:05 -08:00 committed by proller
parent b401e58c0d
commit a92e90f684
1 changed files with 44 additions and 42 deletions
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86
src/mapgen_indev.cpp
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@ -345,50 +345,52 @@ void MapgenIndev::generateFloatIslands(int min_y) {
*/
void MapgenIndev::generateFloatIslands(int min_y) {
if (node_min.Y < min_y) return;
PseudoRandom pr(blockseed + 985);
// originally from http://forum.minetest.net/viewtopic.php?id=4776
float RAR = 0.8 * farscale(0.4, node_min.Y); // 0.4; // Island rarity in chunk layer. -0.4 = thick layer with holes, 0 = 50%, 0.4 = desert rarity, 0.7 = very rare.
float AMPY = 24; // 24; // Amplitude of island centre y variation.
float TGRAD = 24; // 24; // Noise gradient to create top surface. Tallness of island top.
float BGRAD = 24; // 24; // Noise gradient to create bottom surface. Tallness of island bottom.
if (node_min.Y < min_y) return;
PseudoRandom pr(blockseed + 985);
// originally from http://forum.minetest.net/viewtopic.php?id=4776
float RAR = 0.8 * farscale(0.4, node_min.Y); // 0.4; // Island rarity.
float AMPY = 24; // 24; // Amplitude of island centre y variation.
float TGRAD = 24; // 24; // Noise gradient to create top surface.
float BGRAD = 24; // 24; // Noise gradient to create bottom surface.
v3s16 p0(node_min.X, node_min.Y, node_min.Z);
MapNode n1(c_stone);
v3s16 p0(node_min.X, node_min.Y, node_min.Z);
MapNode n1(c_stone);
float xl = node_max.X - node_min.X;
float yl = node_max.Y - node_min.Y;
float zl = node_max.Z - node_min.Z;
float midy = node_min.Y + yl * 0.5;
u32 index = 0, index2d = 0;
for (int x1 = 0; x1 <= xl; ++x1)
{
for (int z1 = 0; z1 <= zl; ++z1, ++index2d)
{
float noise3 = noiseindev_float_islands3->result[index2d];
float pmidy = midy + noise3 / 1.5 * AMPY;
for (int y1 = 0; y1 <= yl; ++y1, ++index)
{
int y = y1 + node_min.Y;
float noise1 = noiseindev_float_islands1->result[index];
float offset = y > pmidy ? (y - pmidy) / TGRAD : (pmidy - y) / BGRAD;
float noise1off = noise1 - offset - RAR;
if (noise1off > 0 && noise1off < 0.7) {
float noise2 = noiseindev_float_islands2->result[index];
if (noise2 - noise1off > -0.7){
v3s16 p = p0 + v3s16(x1, y1, z1);
u32 i = vm->m_area.index(p);
if (!vm->m_area.contains(i))
continue;
// Cancel if not air
if (vm->m_data[i].getContent() != CONTENT_AIR)
continue;
vm->m_data[i] = n1;
}
}
}
}
}
float xl = node_max.X - node_min.X;
float yl = node_max.Y - node_min.Y;
float zl = node_max.Z - node_min.Z;
u32 zstride = xl + 1;
float midy = node_min.Y + yl * 0.5;
u32 index = 0;
for (int z1 = 0; z1 <= zl; ++z1)
{
for (int y1 = 0; y1 <= yl; ++y1)
{
for (int x1 = 0; x1 <= xl; ++x1, ++index)
{
int y = y1 + node_min.Y;
u32 index2d = z1 * zstride + x1;
float noise3 = noiseindev_float_islands3->result[index2d];
float pmidy = midy + noise3 / 1.5 * AMPY;
float noise1 = noiseindev_float_islands1->result[index];
float offset = y > pmidy ? (y - pmidy) / TGRAD : (pmidy - y) / BGRAD;
float noise1off = noise1 - offset - RAR;
if (noise1off > 0 && noise1off < 0.7) {
float noise2 = noiseindev_float_islands2->result[index];
if (noise2 - noise1off > -0.7){
v3s16 p = p0 + v3s16(x1, y1, z1);
u32 i = vm->m_area.index(p);
if (!vm->m_area.contains(i))
continue;
// Cancel if not air
if (vm->m_data[i].getContent() != CONTENT_AIR)
continue;
vm->m_data[i] = n1;
}
}
}
}
}
}
void MapgenIndev::generateExperimental() {