Mapping opacity with an alpha channel

- [Instructor] Picking up from the last movie,…I've got the Arnold Render View already open.…Let's assign a new material to the leaves,…and that'll be a good demonstration of opacity mapping.…Let's pedestal down a little bit in the camera view…with Alt and middle mouse button.…Just go down a bit, and maybe back out…with Alt and right mouse button.…We've got the quadrilateral geometry for the leaves.…It obviously needs to have some mapping…of its transparency.…

I've got a bitmap file ready to map the opacity.…It came from the Paint effects brush…that was the original source for these roses.…So let's go ahead and assign a material.…Select the leaves, right-click,…and from the Marking menu, choose Assign New Material.…From the Assign New Material dialog,…choose Arnold > Shader, and click Surface,…and then choose AI Standard Surface.…Let's rename it in the attribute editor.…

Call it leaf_aistandardsurface.…Scrolling up to the top of the attributes,…let's adjust the base weight.…I'll bring this down a little bit actually…