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Index > High Level Languages > How do Scaling texture uv coordinats ?

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Roman



Joined: 21 Apr 2012
Posts: 1701
Roman 24 Dec 2023, 20:22
In Blender I scaling uv rect.
Code:
uv1.xy = 0.590, 0.890  
uv2.xy = 0.590, 0.596  
uv3.xy = 0.853, 0.890

uv1.xy *=1.66667;
uv2.xy *=1.66667;
uv3.xy *=1.66667;

;I get
uv1.xy = 0.490, 0.989
uv2.xy = 0.490, 0.499
uv3.xy = 0.931, 0.989
    


What is formula ? How this calculated ?
Post 24 Dec 2023, 20:22
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Roman



Joined: 21 Apr 2012
Posts: 1701
Roman 24 Dec 2023, 20:36
I found this, but not sure is this right variant ?
Code:
point scaling(point p,float sx,float sy) {
    point s;

    int c[1][3];
    int a[1][3]={p.x,p.y,1};
    int b[3][3]={sx,0,0,0,sy,0,0,0,1};

    multmat(a,b,c);//result in  с

    s.x=c[0][0];
    s.y=c[0][1];

    return s;
}    
Post 24 Dec 2023, 20:36
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comrade



Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation
comrade 27 Dec 2023, 04:25
Второй вариант использует матрицы. Что именно не понятно? Scaling значит что-то либо увеличить либо уменьшить.
Post 27 Dec 2023, 04:25
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