CGTalk - Sprite HVs with clips on it...wrong shadows?

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Netvudu

10-20-2004, 01:19 AM

Hi.

I´m using some sprite HVs with a clip image over them (of a tree) and it works great excepting...the shadows are misplaced! I mean, they are rendered, but they don´t start at the tree´s base...what gives? (some of the shadows appear ok, while others appear out of place)

Any ideas why this is going on? I would love to show a render with the problem but from this system I can´t currently upload an image to the forum, sorry.:shrug:

PS: On a side note, could anybody explain me how the second clip map-based animation at this page http://www.marlinstudios.com/products/vtf/vtf.htm was done? I mean, there´s a radical change of angle and still no signs of flat planes! How?

uncon

10-20-2004, 02:44 AM

Sometimes HV sprite trees can float, that's probably why the shadows don't fit. I've found that Sprite trees usually work best from far away. I had to make similar low rez-clip mapped trees for a recent project. What I did was make a few mapped polys that had a transparency gradients so they faded out as the camera looked at them at a shallow angle. It works really well and renders pretty quick for medium range shots.

HowardM

10-20-2004, 06:09 AM

resize your image map, so the canvas size is larger than just the tree.
HV Sprites are circular and create a 'spherize filter' effect, so if your tree in the image practically touches the edge of the image, the HV Sprite will be 'bubbled' and distorted...

I bet thats why your shadows dont work right?
Some of the HVs are lower or higher on the ground plane than others?

I dunno about the other movie, looks like RPCs! :D

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