Method set_material_pbr

native/shared/src/scene.rs:533–538

(&mut self, handle: f64, roughness: f32, metalness: f32)

    }

    pub fn set_material_pbr(&mut self, handle: f64, roughness: f32, metalness: f32) {
        if let Some(node) = self.nodes.get_mut(handle) {
            node.material.roughness = roughness;
            node.material.metalness = metalness;
        }
    }

    /// Q8: Set a water-like material on a scene node. The actual animated
    /// wave shader requires a dedicated WGSL pipeline pass (deferred).