Help with 3d math - sprites aligning with rotated objects

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Golelorn

7

Years of Service

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Joined: 20th Nov 2016

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Posted: 27th Jan 2018 14:15 Edited at: 27th Jan 2018 14:16

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Hi guys,

I've run into a problem with sprite placement when I rotate an object. I am not a math wizard, and I know I somehow need to flip the x,y,z coordinates to adjust when I rotate my object to 90 degrees.

0 degrees

90 degrees

Code for the 0 degree rotation.

function get_obj_screen_coords( obj as integer, corner ) // screen coords for sprites that follow objects
	if corner = 1  //right uppercorner 
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/1.9
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/2
		y# = (GetObjectSizeMaxY(obj)- GetObjectSizeMinY(obj))
	elseif corner = 2 //right lower
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/2
		y# = 0
	elseif corner = 3 //left upper
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/2
		y# = (GetObjectSizeMaxY(obj)- GetObjectSizeMinY(obj))
	elseif corner = 4 //left lower
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/-2
		y# = 0
	endif

house_obj_screen_coords[0] = GetScreenXFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )
	house_obj_screen_coords[1] = GetScreenYFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )

endfunction

+ Code Snippet

function get_obj_screen_coords( obj as integer, corner ) // screen coords for sprites that follow objects
	if corner = 1  //right uppercorner 
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/1.9
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/2
		y# = (GetObjectSizeMaxY(obj)- GetObjectSizeMinY(obj))
	elseif corner = 2 //right lower
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/2
		y# = 0
	elseif corner = 3 //left upper
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/2
		y# = (GetObjectSizeMaxY(obj)- GetObjectSizeMinY(obj))
	elseif corner = 4 //left lower
		x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
		z# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/-2
		y# = 0
	endif

	house_obj_screen_coords[0] = GetScreenXFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )
	house_obj_screen_coords[1] = GetScreenYFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )

endfunction

Appreciate any guidance.

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Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 27th Jan 2018 15:34 Edited at: 27th Jan 2018 15:34

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I guess, it wasn't as impossible as I thought.

function get_obj_screen_coords( obj as integer, corner ) // screen coords for sprites that follow objects
	angle# = GetObjectAngleY(obj)
	if angle# < 2
		if corner = 1  //right uppercorner 
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/1.9
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/2
			y# = (GetObjectSizeMaxY(obj)-GetObjectSizeMinY(obj))
		elseif corner = 2 //right lower
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/2
			y# = 0
		elseif corner = 3 //left upper
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/2
			y# = (GetObjectSizeMaxY(obj)-GetObjectSizeMinY(obj))
		elseif corner = 4 //left lower
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/-2
			y# = 0
		endif
	endif
	if angle# > 88
		if corner = 1  //right uppercorner 
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			x# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/.65
			y# = (GetObjectSizeMaxY(obj)-GetObjectSizeMinY(obj))
		elseif corner = 2 //right lower
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			x# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/.65
			y# = 0
		elseif corner = 3 //left upper
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			x# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/-.75
			y# = (GetObjectSizeMaxY(obj)- GetObjectSizeMinY(obj))
		elseif corner = 4 //left lower
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-2
			x# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/-.75
			y# = 0
		endif
	endif

house_obj_screen_coords[0] = GetScreenXFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )
	house_obj_screen_coords[1] = GetScreenYFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )

endfunction

+ Code Snippet

function get_obj_screen_coords( obj as integer, corner ) // screen coords for sprites that follow objects
	angle# = GetObjectAngleY(obj)
	if angle# < 2
		if corner = 1  //right uppercorner 
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/1.9
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/2
			y# = (GetObjectSizeMaxY(obj)-GetObjectSizeMinY(obj))
		elseif corner = 2 //right lower
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/2
			y# = 0
		elseif corner = 3 //left upper
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/2
			y# = (GetObjectSizeMaxY(obj)-GetObjectSizeMinY(obj))
		elseif corner = 4 //left lower
			x# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-1.9
			z# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/-2
			y# = 0
		endif
	endif
	if angle# > 88
		if corner = 1  //right uppercorner 
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			x# = (GetObjectSizeMaxZ(obj)-GetObjectSizeMinZ(obj))/.65
			y# = (GetObjectSizeMaxY(obj)-GetObjectSizeMinY(obj))
		elseif corner = 2 //right lower
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			x# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/.65
			y# = 0
		elseif corner = 3 //left upper
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/2
			x# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/-.75
			y# = (GetObjectSizeMaxY(obj)- GetObjectSizeMinY(obj))
		elseif corner = 4 //left lower
			z# = (GetObjectSizeMaxX(obj)-GetObjectSizeMinX(obj))/-2
			x# = (GetObjectSizeMaxZ(obj)- GetObjectSizeMinZ(obj))/-.75
			y# = 0
		endif
	endif

	house_obj_screen_coords[0] = GetScreenXFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )
	house_obj_screen_coords[1] = GetScreenYFrom3D( getobjectx(obj)+x#, getobjecty(obj)+y#, getobjectz(obj)+z# )

endfunction

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