A slight change in appearance #39
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| package me.alegian.thavma.impl.client.particle | ||
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| import com.mojang.blaze3d.vertex.VertexConsumer | ||
| import net.minecraft.client.Camera | ||
| import net.minecraft.client.Minecraft | ||
| import net.minecraft.client.multiplayer.ClientLevel | ||
| import net.minecraft.client.particle.ParticleProvider | ||
| import net.minecraft.client.particle.TextureSheetParticle | ||
| import net.minecraft.client.particle.SpriteSet | ||
| import net.minecraft.client.renderer.LightTexture | ||
| import net.minecraft.core.particles.SimpleParticleType | ||
| import net.minecraft.util.Mth | ||
| import net.minecraft.world.phys.Vec3 | ||
| import org.joml.Quaternionf | ||
| import org.joml.Vector3f | ||
| import kotlin.math.abs | ||
| import kotlin.math.cos | ||
| import kotlin.math.max | ||
| import kotlin.math.min | ||
| import kotlin.math.roundToInt | ||
| import kotlin.math.sin | ||
| import kotlin.math.sqrt | ||
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| private const val STRETCH_RATIO = 5.0f | ||
| private const val MIN_HALF_LENGTH = 0.06f | ||
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| class VisTrailParticle private constructor( | ||
| level: ClientLevel, | ||
| x: Double, | ||
| y: Double, | ||
| z: Double, | ||
| private val target: Vec3, | ||
| color: Int, | ||
| private val phase: Float, | ||
| scale: Float, | ||
| private val spriteSet: SpriteSet | ||
| ) : TextureSheetParticle(level, x, y, z, .0, .0, .0) { | ||
| private val initialSize: Float | ||
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| companion object { | ||
| var spriteSet: SpriteSet? = null | ||
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| fun spawn(start: Vec3, target: Vec3, color: Int, phase: Int, scale: Float, progress: Float = 0f) { | ||
| val mc = Minecraft.getInstance() | ||
| val level = mc.level as? ClientLevel ?: return | ||
| val spriteSet = spriteSet ?: return | ||
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| val spawnPos = start.lerp(target, progress.toDouble()) | ||
| val jitter = 0.015 | ||
| val x = spawnPos.x + (level.random.nextDouble() - 0.5) * jitter | ||
| val y = spawnPos.y + (level.random.nextDouble() - 0.5) * jitter | ||
| val z = spawnPos.z + (level.random.nextDouble() - 0.5) * jitter | ||
| runCatching { | ||
| mc.particleEngine.add(VisTrailParticle(level, x, y, z, target, color, phase.toFloat(), scale, spriteSet)) | ||
| } | ||
| } | ||
| } | ||
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| init { | ||
| val toTarget = target.subtract(x, y, z) | ||
| val distance = toTarget.length().coerceAtLeast(0.001) | ||
| val forward = toTarget.normalize() | ||
| val tempUp = if (abs(forward.y) > 0.9) Vec3(1.0, 0.0, 0.0) else Vec3(0.0, 1.0, 0.0) | ||
| val side = forward.cross(tempUp).normalize() | ||
| val up = side.cross(forward).normalize() | ||
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| val colorVariance = 0.05f | ||
| val red = (color shr 16 and 0xFF) / 255f | ||
| val green = (color shr 8 and 0xFF) / 255f | ||
| val blue = (color and 0xFF) / 255f | ||
| setColor( | ||
| red - red * colorVariance + random.nextFloat() * red * colorVariance, | ||
| green - green * colorVariance + random.nextFloat() * green * colorVariance, | ||
| blue - blue * colorVariance + random.nextFloat() * blue * colorVariance | ||
| ) | ||
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| alpha = 0.6f | ||
| hasPhysics = false | ||
| gravity = 0f | ||
| lifetime = (distance * 22.0).roundToInt().coerceIn(14, 50) | ||
| quadSize = scale * (0.92f + random.nextFloat() * 0.16f) | ||
| initialSize = quadSize | ||
| pickSprite(spriteSet) | ||
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| val swirl1 = sin(phase * 0.43f).toDouble() * 0.006 | ||
| val swirl2 = cos(phase * 0.31f).toDouble() * 0.004 | ||
| xd = forward.x * 0.04 + side.x * swirl1 + up.x * swirl2 + random.nextGaussian() * 0.0004 | ||
| yd = forward.y * 0.04 + side.y * swirl1 + up.y * swirl2 + random.nextGaussian() * 0.0004 | ||
| zd = forward.z * 0.04 + side.z * swirl1 + up.z * swirl2 + random.nextGaussian() * 0.0004 | ||
| } | ||
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| override fun render(buffer: VertexConsumer, camera: Camera, partialTick: Float) { | ||
| val px = Mth.lerp(partialTick.toDouble(), xo, x) - camera.position.x | ||
| val py = Mth.lerp(partialTick.toDouble(), yo, y) - camera.position.y | ||
| val pz = Mth.lerp(partialTick.toDouble(), zo, z) - camera.position.z | ||
|
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| val vel = Vec3(xd, yd, zd) | ||
| val speed = vel.length() | ||
| val stretchDir = if (speed > 1.0E-6) vel.normalize() else (target.subtract(x, y, z)).let { if (it.lengthSqr() > 1.0E-6) it.normalize() else Vec3(1.0, 0.0, 0.0) } | ||
| val camToParticle = Vec3(px, py, pz) | ||
| if (camToParticle.lengthSqr() < 1.0E-6) { super.render(buffer, camera, partialTick); return } | ||
| val camDir = camToParticle.normalize() | ||
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| var sideVec = stretchDir.cross(camDir) | ||
| if (sideVec.lengthSqr() < 1.0E-6) { super.render(buffer, camera, partialTick); return } | ||
| sideVec = sideVec.normalize() | ||
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| val halfWidth = quadSize * 0.28f | ||
| val halfLength = max(quadSize * STRETCH_RATIO * 0.5f, MIN_HALF_LENGTH) | ||
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| val sx = sideVec.x.toFloat() * halfWidth | ||
| val sy = sideVec.y.toFloat() * halfWidth | ||
| val sz = sideVec.z.toFloat() * halfWidth | ||
| val vx = stretchDir.x.toFloat() * halfLength | ||
| val vy = stretchDir.y.toFloat() * halfLength | ||
| val vz = stretchDir.z.toFloat() * halfLength | ||
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| val cx = px.toFloat() | ||
| val cy = py.toFloat() | ||
| val cz = pz.toFloat() | ||
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| val u0 = getU0() | ||
| val u1 = getU1() | ||
| val v0 = getV0() | ||
| val v1 = getV1() | ||
| val light = getLightColor(partialTick) | ||
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| buffer.addVertex(cx - sx + vx, cy - sy + vy, cz - sz + vz) | ||
| .setUv(u1, v0).setColor(rCol, gCol, bCol, alpha).setLight(light) | ||
| buffer.addVertex(cx + sx + vx, cy + sy + vy, cz + sz + vz) | ||
| .setUv(u1, v1).setColor(rCol, gCol, bCol, alpha).setLight(light) | ||
| buffer.addVertex(cx + sx - vx, cy + sy - vy, cz + sz - vz) | ||
| .setUv(u0, v1).setColor(rCol, gCol, bCol, alpha).setLight(light) | ||
| buffer.addVertex(cx - sx - vx, cy - sy - vy, cz - sz - vz) | ||
| .setUv(u0, v0).setColor(rCol, gCol, bCol, alpha).setLight(light) | ||
| } | ||
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| override fun tick() { | ||
| xo = x | ||
| yo = y | ||
| zo = z | ||
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| if (age++ >= lifetime) { | ||
| remove() | ||
| return | ||
| } | ||
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| val dx = target.x - x | ||
| val dy = target.y - y | ||
| val dz = target.z - z | ||
| val distance = sqrt(dx * dx + dy * dy + dz * dz) | ||
| if (distance < 0.1) { | ||
| remove() | ||
| return | ||
| } | ||
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| val invDistance = 1.0 / distance | ||
| val attraction = 0.02 + 0.035 / max(1.0, distance) | ||
| xd = Mth.clamp(xd * 0.96 + dx * invDistance * attraction, -0.09, 0.09) | ||
| yd = Mth.clamp(yd * 0.96 + dy * invDistance * attraction, -0.09, 0.09) | ||
| zd = Mth.clamp(zd * 0.96 + dz * invDistance * attraction, -0.09, 0.09) | ||
| move(xd, yd, zd) | ||
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| val pulse = 0.94f + 0.08f * sin((age + phase) / 4.5f) | ||
| val shrinkNearEnd = Mth.clamp((distance / 1.7).toFloat(), 0.45f, 1.0f) | ||
| quadSize = initialSize * pulse * shrinkNearEnd | ||
| alpha = 0.3f + 0.5f * min(1f, distance.toFloat()) | ||
| } | ||
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| override fun getLightColor(partialTick: Float) = LightTexture.FULL_BRIGHT | ||
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| override fun getRenderType() = T7ParticleRenderTypes.ETERNAL_FLAME | ||
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| class Provider(private val sprites: SpriteSet) : ParticleProvider<SimpleParticleType> { | ||
| init { | ||
| spriteSet = sprites | ||
| } | ||
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| override fun createParticle(type: SimpleParticleType, level: ClientLevel, x: Double, y: Double, z: Double, xSpeed: Double, ySpeed: Double, zSpeed: Double) = | ||
| VisTrailParticle(level, x, y, z, Vec3(x + xSpeed, y + ySpeed, z + zSpeed), 0xFFFFFF, 0f, 0.1f, sprites) | ||
| } | ||
| } | ||
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| object VisTrailParticles { | ||
| fun spawnBurst(start: Vec3, target: Vec3, colors: List<Int>, seed: Int, count: Int, scale: Float) { | ||
| if (colors.isEmpty()) return | ||
| val safeCount = count.coerceAtLeast(1) | ||
| repeat(safeCount) { index -> | ||
| val color = colors[(seed + index).mod(colors.size)] | ||
| val progress = if (safeCount == 1) 0f else index.toFloat() / safeCount * 0.28f | ||
| VisTrailParticle.spawn(start, target, color, seed * 7 + index * 13, scale, progress) | ||
| } | ||
| } | ||
| } |
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can you explain this to me?