纹理拼接后的Wrap寻址

拼接后的纹理:

正常的草地(不进行WRAP寻址):

WRAP = 5时的情况:

MinFilter = Linear时的情况:

shader实现:

float4x4 matViewProjection; float4 Light_Position; float4 Light_Attenuation; float4 Light_Color; float4 Ambient_Color; float4 vViewPosition; float alpha;

struct VS_INPUT { float4 Position : POSITION0; float3 Normal    : NORMAL0; float2 Texcoord : TEXCOORD0; };

struct VS_OUTPUT { float4 Position : POSITION0; float2 Texcoord : TEXCOORD0; float4 Color     : COLOR0; };

float4 PointLighting(float3 position, float3 normal                     , float3 eyedir, float4 ambient                    , float3 lightpos, float3 lightatt, float4 lightcolor) { float3 lightdir = normalize(position - lightpos); float3 dis = distance(position, lightpos); float disatt = saturate(1 / ( lightatt.x lightatt.y * dis lightatt.z * dis * dis )); float angleatt = saturate(-lightdir * normal); float3 reflectdir = normalize(reflect(lightdir, normal)); float specularatt = pow(saturate(reflectdir * eyedir), alpha);     return ambient lightcolor * disatt * (angleatt specularatt); }

VS_OUTPUT vs_main( VS_INPUT Input ) {    VS_OUTPUT Output;

   Output.Position = mul( Input.Position, matViewProjection );    Output.Texcoord = Input.Texcoord; float3 eyedir = normalize(vViewPosition - Input.Position);    Output.Color = PointLighting(Input.Position, Input.Normal                        , eyedir, Ambient_Color                        , Light_Position, Light_Attenuation, Light_Color);

   return( Output ); }

Reference:

ShaderX3 : Improved Batching via Texture Atlases