Search UV coordinates inside the triangle.

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OldPMan

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Posted: 24th Oct 2010 15:24

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please help move this code into DBPro.
I do not know how to do it.

Vector3 A = new Vector3(1, 0, 0); Vector2 Auv = new Vector2(0, 0);
Vector3 B = new Vector3(10f, 4f, 4f); Vector2 Buv = new Vector2(1, 0);
Vector3 C = new Vector3(0, 6f, 13f); Vector2 Cuv = new Vector2(0.5f, 1);
Vector3 D = new Vector3(4, 3, 5);
Vector3 N = Vector3.Normalize(Vector3.Cross(B - A, C - A));
float AreaABC = Vector3.Dot(N, Vector3.Cross(B - A, C - A));
float AreaPBC = Vector3.Dot(N, Vector3.Cross(B - D, C - D));
float AreaPCA = Vector3.Dot(N, Vector3.Cross(C - D, A - D));
float b = AreaPCA / AreaABC;float a = AreaPBC / AreaABC;
float c = 1.0f - a - b;
Vector2 Duv = a * Auv + b * Buv + c * Cuv;

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OldPMan

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Posted: 24th Oct 2010 16:36 Edited at: 24th Oct 2010 16:37

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I tried to do it myself.
it seems I have failed.
tell me where I was wrong

+ Code Snippet

SUBTRACT VECTOR3 VAR1, BVV, AVV
SUBTRACT VECTOR3 VAR2, CVV, AVV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
NORMALIZE VECTOR3 NV, CPV
SUBTRACT VECTOR3 VAR1, BVV, AVV
SUBTRACT VECTOR3 VAR2, CVV, AVV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaABC#=DOT PRODUCT VECTOR3(NV , CPV)
SUBTRACT VECTOR3 VAR1, BVV, DV
SUBTRACT VECTOR3 VAR2, CVV, DV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaPBC#=DOT PRODUCT VECTOR3(NV , CPV)
SUBTRACT VECTOR3 VAR1, CVV, DV
SUBTRACT VECTOR3 VAR2, AVV, DV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaPCA#=DOT PRODUCT VECTOR3(NV , CPV)
bcs# = AreaPCA# / AreaABC# : acs# = AreaPBC# / AreaABC#
ccs# = 1.0 - acs# - bcs#
MULTIPLY VECTOR2 MV1, Auv
MULTIPLY VECTOR2 MV2, Buv
MULTIPLY VECTOR2 MV3, Cuv
ADD VECTOR2 V2R, MV1, MV2
ADD VECTOR2 V2R, V2R, MV3
UCT#= x vector2(V2R)
VCT#= y vector2(V2R)

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Green Gandalf

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Posted: 24th Oct 2010 16:40 Edited at: 24th Oct 2010 16:43

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** deleted **

Your latest post makes my comments irrelevant.

What were the values of VAR, CPV, etc? Presumably you used make vector3 to create those vectors first?

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OldPMan

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Posted: 24th Oct 2010 16:43 Edited at: 24th Oct 2010 16:44

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all set

global VAR1 : VAR1=50
global VAR2 : VAR2=51
global CPV : CPV=53
global AVV : AVV=54
global BVV : BVV=55
global CVV : CVV=56
global DV : DV=57
global Auv : Auv=58
global Buv : Buv=59
global Cuv : Cuv=60
global MV1 : MV1=61
global MV2 : MV2=62
global MV3 : MV3=63
global V2R : V2R=64
global NV : NV=65

make vector3 VAR1:make vector3 VAR2:make vector3 CPV
make vector3 AVV:make vector3 BVV:make vector3 CVV:make vector3 DV
make vector3 NV
make vector2 Auv:make vector2 Buv:make vector2 Cuv
make vector2 MV1:make vector2 MV2:make vector2 MV3
make vector2 V2R

set vector3 AVV ,tris(intriangle).xa1,tris(intriangle).ya1, tris(intriangle).za1
set vector3 BVV ,tris(intriangle).xa2,tris(intriangle).ya2, tris(intriangle).za2
set vector3 CVV ,tris(intriangle).xa3,tris(intriangle).ya3, tris(intriangle).za3
set vector3 DV  , dx,dy, dz
set vector2 Auv,(tris(intriangle).u1), (tris(intriangle).v1)
set vector2 Buv,(tris(intriangle).u2), (tris(intriangle).v2)
set vector2 Cuv,(tris(intriangle).u3), (tris(intriangle).v3)
`--------------------------------
SUBTRACT VECTOR3 VAR1, BVV, AVV
SUBTRACT VECTOR3 VAR2, CVV, AVV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
NORMALIZE VECTOR3 NV, CPV
SUBTRACT VECTOR3 VAR1, BVV, AVV
SUBTRACT VECTOR3 VAR2, CVV, AVV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaABC#=DOT PRODUCT VECTOR3(NV , CPV)
SUBTRACT VECTOR3 VAR1, BVV, DV
SUBTRACT VECTOR3 VAR2, CVV, DV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaPBC#=DOT PRODUCT VECTOR3(NV , CPV)
SUBTRACT VECTOR3 VAR1, CVV, DV
SUBTRACT VECTOR3 VAR2, AVV, DV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaPCA#=DOT PRODUCT VECTOR3(NV , CPV)
bcs# = AreaPCA# / AreaABC# : acs# = AreaPBC# / AreaABC#
ccs# = 1.0 - acs# - bcs#
MULTIPLY VECTOR2 MV1, Auv
MULTIPLY VECTOR2 MV2, Buv
MULTIPLY VECTOR2 MV3, Cuv
ADD VECTOR2 V2R, MV1, MV2
ADD VECTOR2 V2R, V2R, MV3
UCT#= x vector2(V2R)
VCT#= y vector2(V2R)

xxx = UCT#*1024
																				yyy = VCT#*1024
																				ppc=image point(sou,xxx,yyy)
																				Image Dot ShotImg, xxx,yyy , ppc
delete vector3 VAR1:delete vector3 VAR2:delete vector3 CPV
delete vector3 AVV:delete vector3 BVV:delete vector3 CVV:delete vector3 DV
delete vector3 NV
delete vector2 Auv:delete vector2 Buv:delete vector2 Cuv
delete vector2 MV1:delete vector2 MV1:delete vector2 MV1
delete vector2 V2R

+ Code Snippet


global VAR1 : VAR1=50
global VAR2 : VAR2=51
global CPV : CPV=53
global AVV : AVV=54
global BVV : BVV=55
global CVV : CVV=56
global DV : DV=57
global Auv : Auv=58
global Buv : Buv=59
global Cuv : Cuv=60
global MV1 : MV1=61
global MV2 : MV2=62
global MV3 : MV3=63
global V2R : V2R=64
global NV : NV=65


make vector3 VAR1:make vector3 VAR2:make vector3 CPV
make vector3 AVV:make vector3 BVV:make vector3 CVV:make vector3 DV
make vector3 NV
make vector2 Auv:make vector2 Buv:make vector2 Cuv
make vector2 MV1:make vector2 MV2:make vector2 MV3
make vector2 V2R

set vector3 AVV ,tris(intriangle).xa1,tris(intriangle).ya1, tris(intriangle).za1
set vector3 BVV ,tris(intriangle).xa2,tris(intriangle).ya2, tris(intriangle).za2
set vector3 CVV ,tris(intriangle).xa3,tris(intriangle).ya3, tris(intriangle).za3
set vector3 DV  , dx,dy, dz
set vector2 Auv,(tris(intriangle).u1), (tris(intriangle).v1)
set vector2 Buv,(tris(intriangle).u2), (tris(intriangle).v2)
set vector2 Cuv,(tris(intriangle).u3), (tris(intriangle).v3)
`--------------------------------
SUBTRACT VECTOR3 VAR1, BVV, AVV
SUBTRACT VECTOR3 VAR2, CVV, AVV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
NORMALIZE VECTOR3 NV, CPV
SUBTRACT VECTOR3 VAR1, BVV, AVV
SUBTRACT VECTOR3 VAR2, CVV, AVV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaABC#=DOT PRODUCT VECTOR3(NV , CPV)
SUBTRACT VECTOR3 VAR1, BVV, DV
SUBTRACT VECTOR3 VAR2, CVV, DV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaPBC#=DOT PRODUCT VECTOR3(NV , CPV)
SUBTRACT VECTOR3 VAR1, CVV, DV
SUBTRACT VECTOR3 VAR2, AVV, DV
CROSS PRODUCT VECTOR3 CPV, VAR1, VAR2
AreaPCA#=DOT PRODUCT VECTOR3(NV , CPV)
bcs# = AreaPCA# / AreaABC# : acs# = AreaPBC# / AreaABC#
ccs# = 1.0 - acs# - bcs#
MULTIPLY VECTOR2 MV1, Auv
MULTIPLY VECTOR2 MV2, Buv
MULTIPLY VECTOR2 MV3, Cuv
ADD VECTOR2 V2R, MV1, MV2
ADD VECTOR2 V2R, V2R, MV3
UCT#= x vector2(V2R)
VCT#= y vector2(V2R)

																				
																				xxx = UCT#*1024
																				yyy = VCT#*1024
																				ppc=image point(sou,xxx,yyy)
																				Image Dot ShotImg, xxx,yyy , ppc
delete vector3 VAR1:delete vector3 VAR2:delete vector3 CPV
delete vector3 AVV:delete vector3 BVV:delete vector3 CVV:delete vector3 DV
delete vector3 NV
delete vector2 Auv:delete vector2 Buv:delete vector2 Cuv
delete vector2 MV1:delete vector2 MV1:delete vector2 MV1
delete vector2 V2R

.....already beside..... for all

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Green Gandalf

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Posted: 24th Oct 2010 16:44

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Our posts seem to be crossing.

What exactly is going wrong?

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OldPMan

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Posted: 24th Oct 2010 16:51

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Quote: "Our posts seem to be crossing."

ou

I myself can not understand.
I have two source code to mine in C + +
and I can not move them in DBPro.
something I did wrong.

I chose a simpler version of it in the first post.

.....already beside..... for all

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Green Gandalf

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Posted: 24th Oct 2010 16:55

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I don't think that snippet calculates the triangle area correctly.

Try this. You can work out for yourself the correct triangle area very easily - it is in fact 4.5.

+ Code Snippet

null = make vector3(1)
null = make vector3(2)
null = make vector3(3)

set vector3 1, 3, 0, 0
set vector3 2, 0, 3, 0
cross product vector3 3, 1, 2
print x vector3(3), " ", y vector3(3), " ", z vector3(3), "   area = ", 0.5 * length vector3(3)

wait key

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DarkBASIC Professional Discussion / Search UV coordinates inside the triangle.