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Code Snippets / [DBP] Simple Shadows

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Dr Tank
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Posted: 14th Nov 2010 18:42 Edited at: 14th Nov 2010 18:43
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A neat trick to do shadows for an object above a flat plane. This will work for single colour shadows for any object (like oldskool black shadows), but for convex objects (eg sphere or box), ghost or alpha will work too.

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bergice
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Posted: 14th Nov 2010 23:15
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That's impressive.

Does it slow down quickly?

51fa1db0ec7c4af52d93a6f5d0e86bc5

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Dr Tank
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Posted: 15th Nov 2010 01:13
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Thanks. I don't think it does, apart from having extra objects for shadows. DBP, DirectX or whatever uses rotation/translation/scaling matrices for objects and limbs anyway. Even if it were doing more matrix multiplications at runtime, they apply to whole limbs rather than individual vertices.
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Green Gandalf
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Posted: 15th Nov 2010 01:15
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Neat.

Now, why does rotating limb 0 of object 2 rather than object 2 itself have that effect - and how did you work it out? Works like magic.
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Dr Tank
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Posted: 15th Nov 2010 02:57
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It's because the order of matrix multiplications. I used to assume that rotating the object was the same thing as rotating limb 0. It achieves the same end, however, what is happening is that the "object" is just a frame, and the limbs are linked to it. With hindsight it makes more sense that way.
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Neuro Fuzzy
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Posted: 16th Nov 2010 11:21
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So there are separate values for the object's rotation and limb 0's rotation?

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Dr Tank
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Posted: 16th Nov 2010 18:53
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That's right.

This can be used for a lot of things. It makes it possible to shear the object or scale it along an arbitrary axis.
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Dodga
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Posted: 17th Nov 2010 00:19
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Yeah, for instance with sparky's collision you cannot scale an object and have it work correctly, if you use scale limb 0 you can scale and sparky's will actually work with it.
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Stab in the Dark software
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Posted: 17th Nov 2010 16:10
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This is a neat trick, you have done it again Dr.Tank.

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baxslash
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Posted: 22nd Nov 2010 16:26
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Quote: "Yeah, for instance with sparky's collision you cannot scale an object and have it work correctly, if you use scale limb 0 you can scale and sparky's will actually work with it."

Really, I thought you could use "SC_allowObjectScaling"?

I tend to scale objects using this code anyway but I don't tend to scale objects after setting them up with sparky's:


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