Pick object question - GameCreators Forum

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Sph!nx

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Joined: 3rd Dec 2008

Location: The Netherlands

Posted: 12th Aug 2010 17:36

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Hello everyone,

My program has 3d objects that I want to be able to select with a mouse click. Everything works great, but it not only selects the object under the mouse cursor, but also all other objects behind the object I wish to select...

Here is the code I'm using. Any help is much appreciated!

+ Code Snippet

// Object Update
function object_update()

	total_count = array count(object(0))
	
	for ID = 1 to total_count

		// If there is no properties window opened
		if getgadgetvisible (object_properties_win) = 0
		
			// Select/Deselect
			if mouseclick() = 1

				if pick object(mousex(), mousey(), 1, ID) = ID
					
					if object(ID).selected = 0
						
						object(ID).selected = 1
						set object wireframe object(ID).mesh, 1


						// If 'Ctrl' is pressed
						if keystate (29) = 1 and keystate (157) = 1
							object(ID).selected = 0
							set object wireframe object(ID).mesh, 0
						endif

					endif
					
				else
					
					// If 'Shift' is NOT pressed
					if keystate (42) = 0 and keystate (54) = 0
						object(ID).selected = 0
						set object wireframe object(ID).mesh, 0
					endif

				endif

			endif
		
		endif
	
	next ID

endfunction

Thanks ahead!

Regards,
Sph!nx

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Hawkblood

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Posted: 12th Aug 2010 17:43

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You should order them by distance. Also, I think pick object uses collision spheres or boxes for the collision. If that's the case, you should record all the objects and do another loop to do a raycast and get the shortest distance.

The fastest code is the code never written.

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baxslash

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Joined: 26th Dec 2006

Location: Duffield

Posted: 12th Aug 2010 18:31

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If you only want to pick the front object you should only use "pick object" once. You are calling it in a "for" loop including all of your objects...

Try taking it out of a loop and do it like this:

+ Code Snippet

// Object Update
function object_update()

	total_count = array count(object(0))

		// If there is no properties window opened
		if getgadgetvisible (object_properties_win) = 0
		
			// Select/Deselect
			if mouseclick() = 1

				ID=pick object(mousex(), mousey(), 1, total_count)
				
				if ID<>0
					
					if object(ID).selected = 0
						
						object(ID).selected = 1
						set object wireframe object(ID).mesh, 1


						// If 'Ctrl' is pressed
						if keystate (29) = 1 and keystate (157) = 1
							object(ID).selected = 0
							set object wireframe object(ID).mesh, 0
						endif

					endif
					
				else
					
					// If 'Shift' is NOT pressed
					if keystate (42) = 0 and keystate (54) = 0
						object(ID).selected = 0
						set object wireframe object(ID).mesh, 0
					endif

				endif

			endif
		
		endif

endfunction

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Sph!nx

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Joined: 3rd Dec 2008

Location: The Netherlands

Posted: 12th Aug 2010 18:40 Edited at: 12th Aug 2010 18:42

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Thanks Hawkblood, but I don't have much experience yet with ray casting...

I've got a de-selection code working that might offer me the solution. What I now need to know, is how to limit the distance of the pick object. Any ideas?

Edit:
Thanks, baxslash, we posted at the same time. I will take a look and give it a try!

Regards,
Sph!nx

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Hawkblood

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Posted: 12th Aug 2010 18:46

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When you do a pick object, there are some other commands that will give you more info about the object picked. "get pick distance" I think is what will give you the distance of the object "picked". I can't verify this at the computer I'm on now, but you can go to the help and under "commands" select "basic 3D commands" (or something like that) and under "object expression" (I think) you will find all the "pick" commands. Play around with that and you should find what you need.

The fastest code is the code never written.

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Sph!nx

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Posted: 12th Aug 2010 19:09 Edited at: 12th Aug 2010 19:09

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baxslash, your help did it. Though, I've got a slightly different setup than what you provided, in basics it's the same, a separate function!

Thanks a lot to the both of you!

Regards,
Sph!nx

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