3ds Max 2019: I have added a floor for my scene to accept shadows only by giving it a Map to Material with a Shadow Matte input as a material. I have some translucent syringes and bottles that are working great, giving me the alpha output I need for inserting the images on a PPT background - except where they cross the floor object, which makes them opaque (pipettes, bottles and syringes) - I left the floor small so you can see the line. Here's the alpha map for reference:
And on the PPT background. Just want the shadows without losing the object transparency. TIA for any info!