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Match vanilla ore sphere math

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This commit is contained in:
Daniar Mannanov 2026-08-17 01:14:24 +03:00
parent c68c5c2744
commit cb60050801
5 changed files with 110 additions and 114 deletions
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124
internal/world/placed_features.go
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@ -108,12 +108,37 @@ func flattenBlockTag(set *worldgen.FeatureSet, tag string, visiting map[string]b
}
func placeOreEllipsoid(c *Chunk, random worldgen.RandomSource, originX, originY, originZ, size int, discard float64, targets []resolvedOreTarget) {
spheres := buildOreSpheres(random, originX, originY, originZ, size)
walkOreBlocks(spheres, func(x, y, z int) {
localX := x - int(c.X)*16
if localX < 0 || localX >= 16 {
return
}
if y < MinY || y >= MinY+WorldHeight {
return
}
localZ := z - int(c.Z)*16
if localZ < 0 || localZ >= 16 {
return
}
current := c.GetBlock(localX, y, localZ)
for _, target := range targets {
if !target.replaceables[current] || discard > 0 && random.NextFloat() < float32(discard) && exposedToAir(c, localX, y, localZ) {
continue
}
c.SetBlock(localX, y, localZ, target.state)
break
}
})
}
func buildOreSpheres(random worldgen.RandomSource, originX, originY, originZ, size int) []oreSphere {
angle := random.NextFloat() * float32(math.Pi)
extent := float32(size) / 8.0
x0 := float64(originX) + math.Sin(float64(angle))*float64(extent)
x1 := float64(originX) - math.Sin(float64(angle))*float64(extent)
z0 := float64(originZ) + math.Cos(float64(angle))*float64(extent)
z1 := float64(originZ) - math.Cos(float64(angle))*float64(extent)
x0 := float64(originX) + float64(worldgen.MthSin(float64(angle))*extent)
x1 := float64(originX) - float64(worldgen.MthSin(float64(angle))*extent)
z0 := float64(originZ) + float64(worldgen.MthCos(float64(angle))*extent)
z1 := float64(originZ) - float64(worldgen.MthCos(float64(angle))*extent)
y0 := float64(originY + int(random.NextIntN(3)) - 2)
y1 := float64(originY + int(random.NextIntN(3)) - 2)
@ -121,7 +146,8 @@ func placeOreEllipsoid(c *Chunk, random worldgen.RandomSource, originX, originY,
for i := 0; i < size; i++ {
t := float32(i) / float32(size)
randomScale := random.NextDouble() * float64(size) / 16.0
radius := ((float64(worldgen.MthSin(float64(float32(math.Pi)*t)))+1.0)*randomScale + 1.0) / 2.0
wave := worldgen.MthSin(float64(float32(math.Pi)*t)) + float32(1.0)
radius := (float64(wave)*randomScale + 1.0) / 2.0
spheres[i] = oreSphere{
x: x0 + (x1-x0)*float64(t),
y: y0 + (y1-y0)*float64(t),
@ -149,35 +175,35 @@ func placeOreEllipsoid(c *Chunk, random worldgen.RandomSource, originX, originY,
}
}
}
walkOreBlocks(spheres, func(x, y, z int) {
localX := x - int(c.X)*16
if localX < 0 || localX >= 16 {
return
}
if y < MinY || y >= MinY+WorldHeight {
return
}
localZ := z - int(c.Z)*16
if localZ < 0 || localZ >= 16 {
return
}
current := c.GetBlock(localX, y, localZ)
for _, target := range targets {
if !target.replaceables[current] || discard > 0 && random.NextFloat() < float32(discard) && exposedToAir(c, localX, y, localZ) {
continue
}
c.SetBlock(localX, y, localZ, target.state)
break
}
})
return spheres
}
func walkOreBlocks(spheres []oreSphere, visit func(x, y, z int)) {
minX, maxX, minY, maxY, minZ, maxZ := oreBounds(spheres)
for x := minX; x <= maxX; x++ {
for y := minY; y <= maxY; y++ {
for z := minZ; z <= maxZ; z++ {
if oreContains(spheres, x, y, z) {
visited := make(map[[3]int]bool)
for _, sphere := range spheres {
if sphere.radius < 0 {
continue
}
minX, maxX := int(math.Floor(sphere.x-sphere.radius)), int(math.Floor(sphere.x+sphere.radius))
minY, maxY := int(math.Floor(sphere.y-sphere.radius)), int(math.Floor(sphere.y+sphere.radius))
minZ, maxZ := int(math.Floor(sphere.z-sphere.radius)), int(math.Floor(sphere.z+sphere.radius))
for x := minX; x <= maxX; x++ {
dx := (float64(x) + 0.5 - sphere.x) / sphere.radius
if dx*dx >= 1 {
continue
}
for y := minY; y <= maxY; y++ {
dy := (float64(y) + 0.5 - sphere.y) / sphere.radius
if dx*dx+dy*dy >= 1 {
continue
}
for z := minZ; z <= maxZ; z++ {
dz := (float64(z) + 0.5 - sphere.z) / sphere.radius
position := [3]int{x, y, z}
if dx*dx+dy*dy+dz*dz >= 1 || visited[position] {
continue
}
visited[position] = true
visit(x, y, z)
}
}
@ -185,42 +211,6 @@ func walkOreBlocks(spheres []oreSphere, visit func(x, y, z int)) {
}
}
func oreBounds(spheres []oreSphere) (minX, maxX, minY, maxY, minZ, maxZ int) {
found := false
for _, sphere := range spheres {
if sphere.radius < 0 {
continue
}
loX, hiX := int(math.Floor(sphere.x-sphere.radius)), int(math.Floor(sphere.x+sphere.radius))
loY, hiY := int(math.Floor(sphere.y-sphere.radius)), int(math.Floor(sphere.y+sphere.radius))
loZ, hiZ := int(math.Floor(sphere.z-sphere.radius)), int(math.Floor(sphere.z+sphere.radius))
if !found {
minX, maxX, minY, maxY, minZ, maxZ = loX, hiX, loY, hiY, loZ, hiZ
found = true
continue
}
minX, maxX = min(minX, loX), max(maxX, hiX)
minY, maxY = min(minY, loY), max(maxY, hiY)
minZ, maxZ = min(minZ, loZ), max(maxZ, hiZ)
}
return
}
func oreContains(spheres []oreSphere, x, y, z int) bool {
for _, sphere := range spheres {
if sphere.radius < 0 {
continue
}
dx := (float64(x) + 0.5 - sphere.x) / sphere.radius
dy := (float64(y) + 0.5 - sphere.y) / sphere.radius
dz := (float64(z) + 0.5 - sphere.z) / sphere.radius
if dx*dx+dy*dy+dz*dz < 1 {
return true
}
}
return false
}
func exposedToAir(c *Chunk, x, y, z int) bool {
for _, offset := range [][3]int{{1, 0, 0}, {-1, 0, 0}, {0, 1, 0}, {0, -1, 0}, {0, 0, 1}, {0, 0, -1}} {
nx, ny, nz := x+offset[0], y+offset[1], z+offset[2]