Java Vec3d.dotProduct方法代碼示例

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
private static void onClientUpdate(EntityPlayer player) {
    checkDummy(player);
    // if position was changed between two updates,
    if (clientPosition != null
        && (getX(clientPosition) != getPrevX(player)
         || getY(clientPosition) != getPrevY(player)
         || getZ(clientPosition) != getPrevZ(player))) {
        // then emulate the handling of S08PacketPlayerPosLook
        serverMotion   = clientMotion = getMotion(player);
        serverPosition = getPosition(player);
        emulateHandleMotion(player, getPosition(player), false);
    }
    clientPosition = getPosition(player);
    // if motion was changed between two updates, use it
    Vec3d gain = getMotion(player).subtract(clientMotion);
    //serverMotion = serverMotion.add(gain);
    if (gain.dotProduct(gain) > 0) serverMotion = getMotion(player);
    // anticipated new position and motion
    setPosition(serverDummy, serverPosition);
    setMotion(serverDummy,   serverMotion);
    serverDummy.onUpdate();
    serverNextPosition = getPosition(serverDummy);
    serverNextMotion   = getMotion(serverDummy);
    anticipated = true;
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Checks to see if this enderman should be attacking this player
 */
private boolean shouldAttackPlayer(EntityPlayer player)
{
    ItemStack itemstack = (ItemStack)player.inventory.armorInventory.get(3);

    if (itemstack.getItem() == Item.getItemFromBlock(Blocks.PUMPKIN))
    {
        return false;
    }
    else
    {
        Vec3d vec3d = player.getLook(1.0F).normalize();
        Vec3d vec3d1 = new Vec3d(this.posX - player.posX, this.getEntityBoundingBox().minY + (double)this.getEyeHeight() - (player.posY + (double)player.getEyeHeight()), this.posZ - player.posZ);
        double d0 = vec3d1.lengthVector();
        vec3d1 = vec3d1.normalize();
        double d1 = vec3d.dotProduct(vec3d1);
        return d1 > 1.0D - 0.025D / d0 ? player.canEntityBeSeen(this) : false;
    }
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Checks to see if this enderman should be attacking this player
 */
private boolean shouldAttackPlayer(EntityPlayer player)
{
    ItemStack itemstack = player.inventory.armorInventory[3];

    if (itemstack != null && itemstack.getItem() == Item.getItemFromBlock(Blocks.PUMPKIN))
    {
        return false;
    }
    else
    {
        Vec3d vec3d = player.getLook(1.0F).normalize();
        Vec3d vec3d1 = new Vec3d(this.posX - player.posX, this.getEntityBoundingBox().minY + (double)this.getEyeHeight() - (player.posY + (double)player.getEyeHeight()), this.posZ - player.posZ);
        double d0 = vec3d1.lengthVector();
        vec3d1 = vec3d1.normalize();
        double d1 = vec3d.dotProduct(vec3d1);
        return d1 > 1.0D - 0.025D / d0 ? player.canEntityBeSeen(this) : false;
    }
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
private boolean isEntityWithinPlayerFOV(EntityPlayer player, Entity entity) {
    // code used from the Enderman player looking code.
    Vec3d vec3 = player.getLook(1.0F).normalize();
    Vec3d vec31 = new Vec3d(entity.posX - player.posX, entity.getEntityBoundingBox().minY + entity.height / 2.0F - (player.posY + player.getEyeHeight()), entity.posZ - player.posZ);
    double d0 = vec31.lengthVector();
    vec31 = vec31.normalize();
    double d1 = vec3.dotProduct(vec31);
    return d1 > 1.0D - 2.5D / d0;
    // return d1 > 1.0D - 0.025D / d0;
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
private boolean isPlayerLookingAtTarget() {
    // code used from the Enderman player looking code.
    EntityPlayer player = FMLClientHandler.instance().getClient().player;
    World world = FMLClientHandler.instance().getClient().world;
    Vec3d vec3 = player.getLook(1.0F).normalize();
    Vec3d vec31 = new Vec3d(entity.posX - player.posX, entity.getEntityBoundingBox().minY + entity.height / 2.0F - (player.posY + player.getEyeHeight()), entity.posZ - player.posZ);
    double d0 = vec31.lengthVector();
    vec31 = vec31.normalize();
    double d1 = vec3.dotProduct(vec31);
    return d1 > 1.0D - 0.050D / d0;
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
private boolean isPlayerLookingAtTarget() {
    Vec3d vec3 = player.getLook(1.0F).normalize();
    Vec3d vec31 = new Vec3d(pos.getX() + 0.5D - player.posX, pos.getY() + 0.5D - player.posY - player.getEyeHeight(), pos.getZ() + 0.5D - player.posZ);
    double d0 = vec31.lengthVector();
    vec31 = vec31.normalize();
    double d1 = vec3.dotProduct(vec31);
    return d1 > 1.0D - 0.025D / d0;
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Check if a point is within a triangle.
 * Point is assumed to on same plane as triangle.
 */
private static boolean pointWithinTriangle(Vec3d p, Vec3d v0, Vec3d v1, Vec3d v2)
{
	Vec3d u = v0.subtract(v1);
	Vec3d v = v0.subtract(v2);
	Vec3d w = v0.subtract(p);
	//System.out.println(u + " " + v + " " + w);
	double dn = u.dotProduct(v)*u.dotProduct(v)-u.dotProduct(u)*v.dotProduct(v);
	double s = (u.dotProduct(v)*w.dotProduct(v)-v.dotProduct(v)*w.dotProduct(u))/dn;
	double t = (u.dotProduct(v)*w.dotProduct(u)-u.dotProduct(u)*w.dotProduct(v))/dn;
	if(s>=0 && t>=0 && s+t<=1 && s != -0.0F && t != -0.0F)
		return true;
	return false;
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Calculate the point of intersection between a ray and a plane.
 * @param ray - Ray to test.
 * @param p - Point on plane.
 * @param n - Normal to plane.
 * @return - Point on plane where ray intersects, null if no intersection.
 */
public static Vec3d getRayPlaneIntersection(RayTrace ray, Vec3d p, Vec3d n)
{
	//Vector in direction of line
	Vec3d l = ray.p1.subtract(ray.p0);

	double rd = n.dotProduct(l);
	if(rd == 0)
		return p;
	double r = n.dotProduct(p.subtract(ray.p1))/rd;
	return addVector(ray.p1, scale(l,r));
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
public static double getAngleBetweenVectors(Vec3d v, Vec3d w, Vec3d n)
{
	double angleDot =  Math.acos(v.dotProduct(w)/(v.lengthVector()*w.lengthVector()));
	Vec3d crossProduct = v.crossProduct(w);
	if(n.dotProduct(crossProduct) < 0)
		angleDot *= -1;
	return angleDot;
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
private boolean shouldAttackPlayer(EntityPlayer player) {
	ItemStack itemstack = player.inventory.armorInventory.get(3);

	if (itemstack.getItem() == Item.getItemFromBlock(Blocks.PUMPKIN) || itemstack.getItem() instanceof ItemSkullBase) {
		return false;
	}
	else {
		Vec3d vec3d = player.getLook(1.0F).normalize();
		Vec3d vec3d1 = new Vec3d(posX - player.posX, getEntityBoundingBox().minY + getEyeHeight() - (player.posY + player.getEyeHeight()), posZ - player.posZ);
		double d0 = vec3d1.lengthVector();
		vec3d1 = vec3d1.normalize();
		double d1 = vec3d.dotProduct(vec3d1);
		return d1 > 1.0D - 0.025D / d0 ? player.canEntityBeSeen(this) : false;
	}
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
private static Vec3d reflect(Vec3d dir, Vec3d normal)
{
	//dir - 2.0 * dot(normal, dir) * normal
	double dot = dir.dotProduct(normal);
	
	double x = dir.xCoord - 2.0 * dot * normal.xCoord;
	double y = dir.yCoord - 2.0 * dot * normal.yCoord;
	double z = dir.zCoord - 2.0 * dot * normal.zCoord;
	
	return new Vec3d(x, y, z);
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * @param x coordinates of point to be tested 
 * @param t coordinates of apex point of cone
 * @param b coordinates of center of basement circle
 * @param aperture in radians
 */
static public boolean isLyingInCone(Vec3d x, Vec3d start, Vec3d end, 
                                    float aperture){

    // This is for our convenience
    float halfAperture = aperture/2.f;

    // Vector pointing to X point from apex
    Vec3d apexToXVect = start.subtract(x);

    // Vector pointing from apex to circle-center point.
    Vec3d axisVect = start.subtract(end);

    // X is lying in cone only if it's lying in 
    // infinite version of its cone -- that is, 
    // not limited by "round basement".
    // We'll use dotProd() to 
    // determine angle between apexToXVect and axis.
    boolean isInInfiniteCone = apexToXVect.dotProduct(axisVect)
                               /apexToXVect.lengthVector()/axisVect.lengthVector()
                                 >
                               // We can safely compare cos() of angles 
                               // between vectors instead of bare angles.
                               MathHelper.cos(halfAperture);


    return isInInfiniteCone;

    // X is contained in cone only if projection of apexToXVect to axis
    // is shorter than axis. 
    // We'll use dotProd() to figure projection length.
   /* boolean isUnderRoundCap = dotProd(apexToXVect,axisVect)
                              /magn(axisVect)
                                <
                              magn(axisVect);
    return isUnderRoundCap;*/
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Gives the phase a chance to update its status.
 * Called by dragon's onLivingUpdate. Only used when !worldObj.isRemote.
 */
public void doLocalUpdate()
{
    ++this.scanningTime;
    EntityLivingBase entitylivingbase = this.dragon.world.getNearestAttackablePlayer(this.dragon, 20.0D, 10.0D);

    if (entitylivingbase != null)
    {
        if (this.scanningTime > 25)
        {
            this.dragon.getPhaseManager().setPhase(PhaseList.SITTING_ATTACKING);
        }
        else
        {
            Vec3d vec3d = (new Vec3d(entitylivingbase.posX - this.dragon.posX, 0.0D, entitylivingbase.posZ - this.dragon.posZ)).normalize();
            Vec3d vec3d1 = (new Vec3d((double)MathHelper.sin(this.dragon.rotationYaw * 0.017453292F), 0.0D, (double)(-MathHelper.cos(this.dragon.rotationYaw * 0.017453292F)))).normalize();
            float f = (float)vec3d1.dotProduct(vec3d);
            float f1 = (float)(Math.acos((double)f) * (180D / Math.PI)) + 0.5F;

            if (f1 < 0.0F || f1 > 10.0F)
            {
                double d0 = entitylivingbase.posX - this.dragon.dragonPartHead.posX;
                double d1 = entitylivingbase.posZ - this.dragon.dragonPartHead.posZ;
                double d2 = MathHelper.clamp(MathHelper.wrapDegrees(180.0D - MathHelper.atan2(d0, d1) * (180D / Math.PI) - (double)this.dragon.rotationYaw), -100.0D, 100.0D);
                this.dragon.randomYawVelocity *= 0.8F;
                float f2 = MathHelper.sqrt(d0 * d0 + d1 * d1) + 1.0F;
                float f3 = f2;

                if (f2 > 40.0F)
                {
                    f2 = 40.0F;
                }

                this.dragon.randomYawVelocity = (float)((double)this.dragon.randomYawVelocity + d2 * (double)(0.7F / f2 / f3));
                this.dragon.rotationYaw += this.dragon.randomYawVelocity;
            }
        }
    }
    else if (this.scanningTime >= 100)
    {
        entitylivingbase = this.dragon.world.getNearestAttackablePlayer(this.dragon, 150.0D, 150.0D);
        this.dragon.getPhaseManager().setPhase(PhaseList.TAKEOFF);

        if (entitylivingbase != null)
        {
            this.dragon.getPhaseManager().setPhase(PhaseList.CHARGING_PLAYER);
            ((PhaseChargingPlayer)this.dragon.getPhaseManager().getPhase(PhaseList.CHARGING_PLAYER)).setTarget(new Vec3d(entitylivingbase.posX, entitylivingbase.posY, entitylivingbase.posZ));
        }
    }
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Gives the phase a chance to update its status.
 * Called by dragon's onLivingUpdate. Only used when !worldObj.isRemote.
 */
public void doLocalUpdate()
{
    ++this.scanningTime;
    EntityLivingBase entitylivingbase = this.dragon.worldObj.getNearestAttackablePlayer(this.dragon, 20.0D, 10.0D);

    if (entitylivingbase != null)
    {
        if (this.scanningTime > 25)
        {
            this.dragon.getPhaseManager().setPhase(PhaseList.SITTING_ATTACKING);
        }
        else
        {
            Vec3d vec3d = (new Vec3d(entitylivingbase.posX - this.dragon.posX, 0.0D, entitylivingbase.posZ - this.dragon.posZ)).normalize();
            Vec3d vec3d1 = (new Vec3d((double)MathHelper.sin(this.dragon.rotationYaw * 0.017453292F), 0.0D, (double)(-MathHelper.cos(this.dragon.rotationYaw * 0.017453292F)))).normalize();
            float f = (float)vec3d1.dotProduct(vec3d);
            float f1 = (float)(Math.acos((double)f) * (180D / Math.PI)) + 0.5F;

            if (f1 < 0.0F || f1 > 10.0F)
            {
                double d0 = entitylivingbase.posX - this.dragon.dragonPartHead.posX;
                double d1 = entitylivingbase.posZ - this.dragon.dragonPartHead.posZ;
                double d2 = MathHelper.clamp_double(MathHelper.wrapDegrees(180.0D - MathHelper.atan2(d0, d1) * (180D / Math.PI) - (double)this.dragon.rotationYaw), -100.0D, 100.0D);
                this.dragon.randomYawVelocity *= 0.8F;
                float f2 = MathHelper.sqrt_double(d0 * d0 + d1 * d1) + 1.0F;
                float f3 = f2;

                if (f2 > 40.0F)
                {
                    f2 = 40.0F;
                }

                this.dragon.randomYawVelocity = (float)((double)this.dragon.randomYawVelocity + d2 * (double)(0.7F / f2 / f3));
                this.dragon.rotationYaw += this.dragon.randomYawVelocity;
            }
        }
    }
    else if (this.scanningTime >= 100)
    {
        entitylivingbase = this.dragon.worldObj.getNearestAttackablePlayer(this.dragon, 150.0D, 150.0D);
        this.dragon.getPhaseManager().setPhase(PhaseList.TAKEOFF);

        if (entitylivingbase != null)
        {
            this.dragon.getPhaseManager().setPhase(PhaseList.CHARGING_PLAYER);
            ((PhaseChargingPlayer)this.dragon.getPhaseManager().getPhase(PhaseList.CHARGING_PLAYER)).setTarget(new Vec3d(entitylivingbase.posX, entitylivingbase.posY, entitylivingbase.posZ));
        }
    }
}
 

import net.minecraft.util.math.Vec3d; //導入方法依賴的package包/類
/**
 * Line l = u + t*v. Return value of t that gives closest point to p.
 * @param u - Point on line.
 * @param v - Direction of line.
 * @param p - Test point.
 * @return t
 */
public static Double getLineScalarForClosestPoint(Vec3d u, Vec3d v, Vec3d p)
{
	//System.out.println(v.dotProduct(v));
	return v.dotProduct(p.subtract(u))/v.dotProduct(v);
}