Adding a color picker...

Shaders are not my strong point but I've usually managed to adapt existing examples to suit my needs, until now.

I found the following 'UVRotation' shader on this forum and it's almost perfect for my needs apart from the lack of a colour picker which as yet, I've failed to address.

Could a shader guru could point me in the right direction ?

Code (CSharp):

1. Shader "Custom/UVRotation"
2. {
3. Properties
4. {
5. _MainTex ("Texture", 2D) = "white" {}
6. _Angle ("Angle", Range(-5.0, 5.0)) = 0.0
7. }
8. SubShader
9. {
10. Tags { "RenderType"="Opaque" }
11.  
12. Pass
13. {
14. CGPROGRAM
15. #pragma vertex vert
16. #pragma fragment frag
17. #include "UnityCG.cginc"
18.  
19. struct v2f {
20. float4 pos : SV_POSITION;
21. float2 uv : TEXCOORD0;
22. };
23.  
24. float _Angle;
25.  
26. v2f vert(appdata_base v)
27. {
28. v2f o;
29. o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
30.  
31. // Pivot
32. float2 pivot = float2(0.5, 0.5);
33. // Rotation Matrix
34. float cosAngle = cos(_Angle);
35. float sinAngle = sin(_Angle);
36. float2x2 rot = float2x2(cosAngle, -sinAngle, sinAngle, cosAngle);
37.  
38. // Rotation consedering pivot
39. float2 uv = v.texcoord.xy - pivot;
40. o.uv = mul(rot, uv);
41. o.uv += pivot;
42.  
43. return o;
44. }
45.  
46. sampler2D _MainTex;
47.  
48. fixed4 frag(v2f i) : SV_Target
49. {
50. // Texel sampling
51. return tex2D(_MainTex, i.uv);
52. }
53.  
54. ENDCG
55. }
56. }
57. }

 

https://www.alanzucconi.com/2015/06/10/a-gentle-introduction-to-shaders-in-unity3d/

 

Thanks for the 'gentle-introduction' link but I've adapted the shader as required.