The Dallas International Film Festival set to run from April 8-18 has added five documentaries to this year’s roster.

The films are Sundance hit Cane Toads: The Conquest; SXSW entries Bear Nation and Lemmy: The Movie; Learning From Light: The Vision Of I.M. Pei; and a portrait of opera figure Barbara Smith Conrad in When I Rise.

Kevin Smith and Nhaelan McMilan produced and Malcolm Ingram directed Bear Nation, which looks at a sometimes controversial subsect within the gay community.

Canes Toads from Mark Lewis will be the first film at the festival to screen in 3D and explores the environmental devastation left in the wake of the toad march across the continent of Australia.

Learning From Light: The Vision Of I.M. Pei is directed by Bo Landin and Sterling Van Wagenen and follows architect I M Pei, now in his nineties, as he works to complete the Museum Of Islamic Art in Qatar.

Lemmy by Wes Orshoski and Greg Oliver examines the legendary Motorhead frotnman and heavy metal icon, featuring appearances by the members of Metallica, Dave Grohl and pro wrestler Triple H.

When I Rise directed by Mat Hames tells the story of Barbara Smith Conrad, a gifted University Of Texas music student who found herself at the epicentre of a racial controversy and struggled against the odds to ascend to the heights of the international opera community.