How to create Convex Hull shapes

[TreantBG]

Hello
i make a game with delphi and the old Newton engine i think 1.3.
The game is 2D. I use the not so good Andorra 2d engine and i made changes to it.
And i want my pictures to have their own shape not just box and my character to collide with empty space (transparent pixels).

So tell me how to create a Convex Hull shape for example a triangle (the Z component is 100 always)

[Julio Jerez]

you just pass teh vetice array, to teh cratecollsion funtions.

[TreantBG]

i know that but my question is how to build the vetice array.
i dont have it ready i have to create it corresponding to the picture.

Can someone to tell me how to build veticle array for a triangle shape Convex Hull?
For example like this

[Julio Jerez]

you take the three point o fthe triangle, and you place then in and array tha has room for 6 point
you copy the thre point i teh first three point o fteh array and you copy teh again in teh last three points.
the add the z dipslacent to teh z compounent of te hfirs three points o fteh array.

teh you cal create conve hull with and array of 6 points,

[TreantBG]

can i get some example code????

[carli2]

If you want pascal code, you can look into the Code of gwX

http://goldenwipf.de/hg/index.cgi/file/ ... sition.pas

For this class, you add the triangles and get out a NewtonCollision.

This algorithm is O(n²), but if you optimize, please contribute it back.

[TreantBG]

Ok i did it with my code.
And i created a function that converts a image to points.
But the problem is this:

this is the points of the image that i get


but when i execute the program this is the real object shape:


How can i make the shape that i want?

[Julio Jerez]

for that you can use NewtonMeshApproximateConvexDecomposition()
but it si a new funtionality of core 300.

[TreantBG]

is there another way?

[Julio Jerez]

you can make it a collision tree if it is static.