Fusion Material Monsters & Ritual Spell Tributes

Fusion Material Monsters used in a Fusion Summon are NOT a cost.

Monsters Tributed with a Ritual Spell Card for a Ritual Summon are NOT a cost.

Both of these are considered to be cards sent to the Graveyard by the resolution of the Spell Card's effect. So the sending/Tribute is carried out at resolution, not at activation.

This means that if the Ritual Spell Card, or "Polymerization", are negated, or have their effects negated, you do NOT send the Fusion Material/Tributes to the Graveyard.

This is also why you can chain "Mask of Restrict" to the activation of a Ritual Spell Card, and prevent the Tribute/Ritual Summon from taking place, because "Mask of Restrict" resolves first, and then prevents the Tribute at resolution of the Ritual Spell Card.