===== Primitive: Elliptic cylinder with x-axis =====

**Definition**: <m>1-(y-y_0)^2/a^2-(z-z_0)^2/b^2</m>

**Call**: hfEllCylX(x,center,a,b);

**Parameters**:

x - point coordinates array

center - cylinder center array

a,b - elliptic half-axes along y,z

**Test file**: [[http://hyperfun.org/ellcyl.hf|ellcyl.hf]]

===== Primitive: Elliptic cylinder with y-axis =====

**Definition**: <m>1-(x-x_0)^2/a^2-(z-z_0)^2/b^2</m>

**Call**: hfEllCylY(x,center,a,b);

**Parameters**:

x - point coordinates array

center - cylinder center array

a,b - elliptic half-axes along x,z

**Test file**: [[http://hyperfun.org/ellcyl.hf|ellcyl.hf]]

===== Primitive: Elliptic cylinder with z-axis =====

**Definition**: <m>1-(x-x_0)^2/a^2-(y-y_0)^2/b^2</m>

**Call**: hfEllCylZ(x,center,a,b);

**Parameters**:

x - point coordinates array

center - cylinder center array

a,b - elliptic half-axes along x,y

**Test file**: [[http://hyperfun.org/ellcyl.hf|ellcyl.hf]]