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select / multi select / deselect a triangle?

Blitz3D Forums/Blitz3D Programming/select / multi select / deselect a triangle?

Guy Fawkes(Posted 2014) [#1]
Hi all. As I complete my program, I thought of 1 last minute thing I wanted to add. Can someone please show me an example of how to single select & multi select / deselect a triangle on an entity?

Thank You so kindly!

~GF


Guy Fawkes(Posted 2014) [#2]
Can anyone please assist?

Thank You! =)

~GF


RemiD(Posted 2014) [#3]
What i have done to do/manage multi selection, is that when ctrl is held, multi select is activated, then when the mouseleft is hit, a camerapick/linepick is done at the cursor position and the next picked thing becomes selected if its selectionstate was notselected and notselected if its selectionstate was selected.
Then depending on each thing selectionstate, i update its appearance (color or alpha)


Guy Fawkes(Posted 2014) [#4]
Do you have an example or know where to find one of multi / single / de-selecting a triangle?

Thank You so kindly!


Chispon(Posted 2014) [#5]
Perhaps it's a dumb idea, but if you are using a low poly mesh, you can separate each polygon into a new entity, then you can easily pick them.


Guy Fawkes(Posted 2014) [#6]
ok, confused with that, @chipson. how would you do this? Can you please show me? I am grateful! :)

Thank You so kindly @chipson & @RemiD! :D


Chispon(Posted 2014) [#7]
Some people know how to get the polygon information of a mesh, but to be honest, I have no idea :/

But I don't know, maybe I'll try to do that.


Guy Fawkes(Posted 2014) [#8]
Any luck, @chipson?

Thank you so kindly!

~GF


Chispon(Posted 2014) [#9]
Yeah, this is my idea, but I don't know if this was you where refering to.

Select Triangles with Left Click and de-select them with Right Click.

Graphics3D 1024, 768, 32, 2
SetBuffer BackBuffer()

Type poly
	Field ent
	Field surf
	Field sel
	Field col[2]
End Type

cam = CreateCamera()
PositionEntity cam, 0, 0, -3

light = CreateLight()
PositionEntity light, 10, 10, 10
temp = CreatePivot(): PointEntity(light, temp): FreeEntity temp

obj = CreateSphere(4)
surf = GetSurface(obj, 1)

For i = 0 To CountTriangles(surf) - 1
	p.poly = New poly
	p\ent = CreateMesh()
	p\surf = CreateSurface(p\ent)
	
	p_v0_x# = VertexX(surf, TriangleVertex(surf, i, 0))
	p_v0_y# = VertexY(surf, TriangleVertex(surf, i, 0))
	p_v0_z# = VertexZ(surf, TriangleVertex(surf, i, 0))
	
	p_v1_x# = VertexX(surf, TriangleVertex(surf, i, 1))
	p_v1_y# = VertexY(surf, TriangleVertex(surf, i, 1))
	p_v1_z# = VertexZ(surf, TriangleVertex(surf, i, 1))
	
	p_v2_x# = VertexX(surf, TriangleVertex(surf, i, 2))
	p_v2_y# = VertexY(surf, TriangleVertex(surf, i, 2))
	p_v2_z# = VertexZ(surf, TriangleVertex(surf, i, 2))
	
	p_v0_nx# = VertexNX(surf, TriangleVertex(surf, i, 0))
	p_v0_ny# = VertexNY(surf, TriangleVertex(surf, i, 0))
	p_v0_nz# = VertexNZ(surf, TriangleVertex(surf, i, 0))
	
	p_v1_nx# = VertexNX(surf, TriangleVertex(surf, i, 1))
	p_v1_ny# = VertexNY(surf, TriangleVertex(surf, i, 1))
	p_v1_nz# = VertexNZ(surf, TriangleVertex(surf, i, 1))
	
	p_v2_nx# = VertexNX(surf, TriangleVertex(surf, i, 2))
	p_v2_ny# = VertexNY(surf, TriangleVertex(surf, i, 2))
	p_v2_nz# = VertexNZ(surf, TriangleVertex(surf, i, 2))
	
	p_v0 = AddVertex(p\surf, p_v0_x#, p_v0_y#, p_v0_z#)
	p_v1 = AddVertex(p\surf, p_v1_x#, p_v1_y#, p_v1_z#)
	p_v2 = AddVertex(p\surf, p_v2_x#, p_v2_y#, p_v2_z#)
	
	VertexNormal p\surf, p_v0, p_v0_nx#, p_v0_ny#, p_v0_nz#
	VertexNormal p\surf,  p_v1, p_v1_nx#, p_v1_ny#, p_v1_nz#
	VertexNormal p\surf, p_v2, p_v2_nx#, p_v2_ny#, p_v2_nz#
	
	p_t0 = AddTriangle(p\surf, p_v0, p_v1, p_v2)
	
	p\col[0] = Rand(0, 255)
	p\col[1] = Rand(0, 255)
	p\col[2] = Rand(0, 255)
	
	EntityColor p\ent, p\col[0], p\col[1], p\col[2]
	EntityPickMode p\ent, 2
Next

FreeEntity obj

fpslock = CreateTimer(60)

While Not KeyDown(1)
	mh1 = MouseHit(1)
	mh2 = MouseHit(2)
	
	CameraPick(cam, MouseX(), MouseY())
	
	picked = PickedEntity()
	
	For p.poly = Each poly
		If mh1 = 1 Then
			If picked = p\ent Then p\sel = 1
		EndIf
		
		If mh2 = 1 Then
			If picked = p\ent Then p\sel = 0
		EndIf
		
		If p\sel = 1 Then
			EntityColor p\ent, 255, 0, 0
		Else
			EntityColor p\ent, p\col[0], p\col[1], p\col[2]
		EndIf
		
		TurnEntity p\ent, 0, 0.1, 0
	Next
	
	RenderWorld()
	
	Text 10, 10, "Picked: " + picked
	
	Flip
Wend

End


I hope you find it useful.


Guy Fawkes(Posted 2014) [#10]
Hi, @Chipson. This is EXACTLY what I'm looking for! But it lacks 2 features.

The ability to select and delete single / multiple triangles from the mesh, and the ability to "re-create" a triangle if the "deleted space" is clicked.

Other than that, it's PERFECT!

Thanks again, @Chipson!

~GF


Chispon(Posted 2014) [#11]
Ok, as I said, It's not the best method anyway xD

But adding that feature you said is easy.
Press Backspace or Del Key to "delete" the selected triangles and click on them again to make them reappear.

Hope it helps! :)

P.S.: my nickname is well written, "Chispon" is a spanish word that means something like "sparky" LOL

Graphics3D 1024, 768, 32, 2
SetBuffer BackBuffer()

Type poly
	Field ent
	Field surf
	Field sel
	Field hide
	Field col[2]
End Type

cam = CreateCamera()
PositionEntity cam, 0, 0, -3

light = CreateLight()
PositionEntity light, 10, 10, 10
temp = CreatePivot(): PointEntity(light, temp): FreeEntity temp

obj = CreateSphere(4)
surf = GetSurface(obj, 1)

For i = 0 To CountTriangles(surf) - 1
	p.poly = New poly
	p\ent = CreateMesh()
	p\surf = CreateSurface(p\ent)
	
	p_v0_x# = VertexX(surf, TriangleVertex(surf, i, 0))
	p_v0_y# = VertexY(surf, TriangleVertex(surf, i, 0))
	p_v0_z# = VertexZ(surf, TriangleVertex(surf, i, 0))
	
	p_v1_x# = VertexX(surf, TriangleVertex(surf, i, 1))
	p_v1_y# = VertexY(surf, TriangleVertex(surf, i, 1))
	p_v1_z# = VertexZ(surf, TriangleVertex(surf, i, 1))
	
	p_v2_x# = VertexX(surf, TriangleVertex(surf, i, 2))
	p_v2_y# = VertexY(surf, TriangleVertex(surf, i, 2))
	p_v2_z# = VertexZ(surf, TriangleVertex(surf, i, 2))
	
	p_v0_nx# = VertexNX(surf, TriangleVertex(surf, i, 0))
	p_v0_ny# = VertexNY(surf, TriangleVertex(surf, i, 0))
	p_v0_nz# = VertexNZ(surf, TriangleVertex(surf, i, 0))
	
	p_v1_nx# = VertexNX(surf, TriangleVertex(surf, i, 1))
	p_v1_ny# = VertexNY(surf, TriangleVertex(surf, i, 1))
	p_v1_nz# = VertexNZ(surf, TriangleVertex(surf, i, 1))
	
	p_v2_nx# = VertexNX(surf, TriangleVertex(surf, i, 2))
	p_v2_ny# = VertexNY(surf, TriangleVertex(surf, i, 2))
	p_v2_nz# = VertexNZ(surf, TriangleVertex(surf, i, 2))
	
	p_v0 = AddVertex(p\surf, p_v0_x#, p_v0_y#, p_v0_z#)
	p_v1 = AddVertex(p\surf, p_v1_x#, p_v1_y#, p_v1_z#)
	p_v2 = AddVertex(p\surf, p_v2_x#, p_v2_y#, p_v2_z#)
	
	VertexNormal p\surf, p_v0, p_v0_nx#, p_v0_ny#, p_v0_nz#
	VertexNormal p\surf,  p_v1, p_v1_nx#, p_v1_ny#, p_v1_nz#
	VertexNormal p\surf, p_v2, p_v2_nx#, p_v2_ny#, p_v2_nz#
	
	p_t0 = AddTriangle(p\surf, p_v0, p_v1, p_v2)
	
	p\col[0] = Rand(0, 255)
	p\col[1] = Rand(0, 255)
	p\col[2] = Rand(0, 255)
	p\hide = 0
	
	EntityColor p\ent, p\col[0], p\col[1], p\col[2]
	EntityPickMode p\ent, 2
Next

FreeEntity obj

fpslock = CreateTimer(60)

While Not KeyDown(1)
	mh1 = MouseHit(1)
	mh2 = MouseHit(2)
	
	CameraPick(cam, MouseX(), MouseY())
	
	picked = PickedEntity()
	
	For p.poly = Each poly
		If mh1 = 1 Then
			If picked = p\ent Then
				If p\hide = 1 Then
					p\sel = 0: p\hide = 0
				Else
					p\sel = 1
				EndIf
			EndIf
		EndIf
		
		If mh2 = 1 Then
			If picked = p\ent Then p\sel = 0
		EndIf
		
		If KeyDown(211) Or KeyDown(14) Then
			If p\sel = 1 Then p\hide = 1: p\sel = 0
		EndIf
		
		If p\sel = 1 Then
			EntityColor p\ent, 255, 0, 0
		Else
			EntityColor p\ent, p\col[0], p\col[1], p\col[2]
		EndIf
		
		If p\hide = 1 Then EntityAlpha p\ent, 0 Else EntityAlpha p\ent, 1
		
		TurnEntity p\ent, 0, 0.1, 0
	Next
	
	RenderWorld()
	
	Text 10, 10, "Picked: " + picked
	
	Flip
Wend

End



Guy Fawkes(Posted 2014) [#12]
Hi, @Chispon! Sorry for the typo :P

Anyway, is there a way to connect each triangle to each other so if we were to say "move" a selected triangle, the object would morph correctly?

Thanks again! :)

~GF


Chispon(Posted 2014) [#13]
Oh, I don't know, I'm pretty sure that Blitz3D can perform mesh morphing, there should be some examples around there.


Guy Fawkes(Posted 2014) [#14]
It's not really "morphing-morphing", I'm after. It's to combine all triangles with each other. I also wanted to be able to actually delete the triangle instead of just hiding it, then make it so it creates a totally new triangle in it's place instead of setting the transparency back to opaque.

Thanks again!

~GF


Guy Fawkes(Posted 2014) [#15]
Well, it's deleting finally, but for some reason, it waits until my mouse is over it and the triangles are all selected for some reason. It also needs the ability to recreate a triangle instantly onto the model.



Thanks again, @Chispon!

~GF


Chispon(Posted 2014) [#16]
Well, my brain is burning, I have no idea on how to do that. I hope someone else have the solution.

Good luck!


Matty(Posted 2014) [#17]
I think sswift has an example in the code archives for ray intersect triangle. Should get you started.


Guy Fawkes(Posted 2014) [#18]
Thanks Matty. I recall seeing it, but I fgt. where it is. ><