Recreate shader in Unity 3D with Cg -


i practicing @ writing shaders running problems. want create shader:

struct c3e4_output {     float4 position : position;     float4 color    : color;   };     c3e4_output c3e4v_twist(float2 position : position,                           float4 color    : color,                             uniform float twisting)   {     c3e4_output out;     float angle = twisting * length(position);     float coslength, sinlength;     sincos(angle, sinlength, coslength);     out.position[0] = coslength * position[0] +                      -sinlength * position[1];     out.position[1] = sinlength * position[0] +                       coslength * position[1];     out.position[2] = 0;     out.position[3] = 1;     out.color = color;     return out;   }

its http://http.developer.nvidia.com/cgtutorial/cg_tutorial_chapter03.html. have somthing result wierd.

enter image description here

this have:

shader "custom/noobshader_02" {     properties {         twisting ("twist", range(-10,10)) = 1     }     subshader {         pass{         cgprogram         #pragma vertex vert         #pragma fragment frag          float twisting;          struct vertexoutput         {             float4 pos : sv_position;             float3 nor : normal;         };          struct vertexinput         {             float4 vertex : position;             float3 normal : normal;         };          struct fragmentoutput         {             float4 color : color;         };          vertexoutput vert (vertexinput i)         {             vertexoutput vout;             vout.pos = mul(unity_matrix_mvp, i.vertex);             float angle = twisting * length(i.vertex);             float coslength, sinlength;             sincos(angle, sinlength, coslength);              vout.pos[0] = coslength * i.vertex[0] +                              -sinlength * i.vertex[1];             vout.pos[1] = sinlength * i.vertex[0] +                              coslength * i.vertex[1];             vout.pos[2] = 0;             vout.pos[3] = 1;              vout.nor[0] = coslength * i.normal[0] +                              -sinlength * i.normal[1];             vout.nor[1] = sinlength * i.normal[0] +                              coslength * i.normal[1];             vout.nor[2] = 0;               return vout;         }          fragmentoutput frag()          {             fragmentoutput fout;             float4 tempcol = {abs(_sintime.z),0,0,1};             fout.color = tempcol;             return fout;         }         endcg         }     }      fallback "diffuse" }

thanks in advance!

i found anwser needed apply matrix after vertex manipulation:

shader "custom/noobshader_02" {     properties {         twisting ("twist", range(-10,10)) = 1     }     subshader {         pass{         cgprogram         #pragma vertex vert         #pragma fragment frag          float twisting;          struct vertexoutput         {             float4 pos : sv_position;             float3 nor : normal;         };          struct vertexinput         {             float4 vertex : position;             float3 normal : normal;         };          struct fragmentoutput         {             float4 color : color;         };          vertexoutput vert (vertexinput i)         {             vertexoutput vout;              float angle = twisting * length(i.vertex);             float coslength, sinlength;             sincos(angle, sinlength, coslength);              i.vertex[0] = coslength * i.vertex[0] +                              -sinlength * i.vertex[1];             i.vertex[1] = sinlength * i.vertex[0] +                              coslength * i.vertex[1];             i.vertex[2] = 0;             i.vertex[3] = 1;              i.normal[0] = coslength * i.normal[0] +                              -sinlength * i.normal[1];             i.normal[1] = sinlength * i.normal[0] +                              coslength * i.normal[1];             i.normal[2] = 0;              vout.pos = mul(unity_matrix_mvp, i.vertex);             vout.nor = mul(unity_matrix_mvp, i.normal);             return vout;         }          fragmentoutput frag()          {             fragmentoutput fout;             float4 tempcol = {abs(_sintime.z),0,0,1};             fout.color = tempcol;             return fout;         }         endcg         }     }      fallback "diffuse" }

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