Example of how to hide tickets that do not have a capability assigned to them from logged in users, so logged in users will only see tickets that have a 'minimum capability' set on them they the user has on their account. This snippet checks for an event meta value 'hide_no_cap_tickets' from within the event before removing any tickets from view.

functions.php

<?php //Please do not include the opening PHP tag if you already have one.

function tw_ee_hide_no_cap_tickets_from_logged_in_users( $return_value, $ticket, $max, $min, $required_ticket_sold_out, $ticket_price, $ticket_bundle, $ticket_status, $status_class) {
	
	$event = $ticket->get_related_event();

	$hide_no_cap_tickets_when_logged_in = $event->get_extra_meta( 'hide_no_cap_tickets', true );

	if( $hide_no_cap_tickets_when_logged_in ) {
		
		$cap_required = $ticket->get_extra_meta( 'ee_ticket_cap_required', true );

		if( empty( $cap_required ) && ( is_user_logged_in() && ! current_user_can( 'manage_options') ) ) {
			return '';
		}

	}

	return $return_value;

}
add_filter( 'FHEE__ticket_selector_chart_template__do_ticket_inside_row', 'tw_ee_hide_no_cap_tickets_from_logged_in_users', 20, 9);

functions2.php

<?php //Please do not include the opening PHP tag if you already have one.

//This function removes tickets with no capabilties set on the ticket, WITHOUT first checking for an event meta value.
function tw_ee_hide_no_cap_tickets_from_logged_in_users( $return_value, $ticket, $max, $min, $required_ticket_sold_out, $ticket_price, $ticket_bundle, $ticket_status, $status_class) {
    	
	//Don't remvoe tickets when adding registrations from the admin.
	if ( is_admin() ) {
            return $return_value;
        }
	
	//Pull the current minimum capability set on the ticket.
	$cap_required = $ticket->get_extra_meta( 'ee_ticket_cap_required', true );
  
	//Check for a capability set and if the user is logged in but not an administrator.
	if( empty( $cap_required ) && ( is_user_logged_in() && ! current_user_can( 'manage_options') ) ) {
		return '';
	}

	return $return_value;

}
add_filter( 'FHEE__ticket_selector_chart_template__do_ticket_inside_row', 'tw_ee_hide_no_cap_tickets_from_logged_in_users', 20, 9);

functions3.php

<?php //Please do not include the opening PHP tag if you already have one.

//This function removes tickets with no capabilties set on the ticket, WITHOUT first checking for an event meta value.
//It also displays the standard messages EE would normally show if the logged in user is a subscriber.
//This is a bit of a hack as you should pass role names to current_user_can() but for the time being it will work.

function tw_ee_hide_no_cap_tickets_from_logged_in_users( $return_value, $ticket, $max, $min, $required_ticket_sold_out, $ticket_price, $ticket_bundle, $ticket_status, $status_class) {
    
    $cap_required = $ticket->get_extra_meta( 'ee_ticket_cap_required', true );
  
    if( empty( $cap_required ) && ( is_user_logged_in() && ! current_user_can( 'manage_options') ) ) {
        if( current_user_can( 'subscriber' ) ){
            return $return_value;
        } else {
            return '';
        }
    }
    return $return_value;
}
add_filter( 'FHEE__ticket_selector_chart_template__do_ticket_inside_row', 'tw_ee_hide_no_cap_tickets_from_logged_in_users', 20, 9);

tw_ee_hide_tickets_from_logged_in_users_with_no_access.php

<?php //Please do not include the opening PHP tag if you already have one.

function tw_ee_hide_tickets_from_logged_in_users_with_no_access( $return_value, $ticket, $max, $min, $required_ticket_sold_out, $ticket_price, $ticket_bundle, $ticket_status, $status_class) {
    //Pull the capbilitiy set on the ticket.
    $cap_required = $ticket->get_extra_meta( 'ee_ticket_cap_required', true );

    // No cap required, return the ticket row as is.
    if(empty($cap_required)) {
        return $return_value;
    }

    // Check if the user is logged in and has the capability for the ticket, if not, return an empty row.
    if(
        is_user_logged_in()
            && ! EE_Registry::instance()->CAP->current_user_can(
                $cap_required,
                'wp_user_ticket_selector_check'
            )
        ) {
            return '';
    }
    return $return_value;
}
add_filter( 'FHEE__ticket_selector_chart_template__do_ticket_inside_row', 'tw_ee_hide_tickets_from_logged_in_users_with_no_access', 20, 9);