OSL-白红宇

OSL

阅读量：6590 次

发布时间：2019-06-24

本文共 4205 字，大约阅读时间需要 14 分钟。

1，SimpleColorShader:

shader gamma(color cin = color(0,0,0),output color Cout=color(0,0,0)){    Cout = cin;}

Katana启动时候会自动编译:

Arnold里bin文件夹里有oslc编译osl文件。但是在centos的GLIB不是2.14,所以单独运行不行。但是在Katana启动调用时候为何自动编译，猜测是Arnold bin文件夹里已经把GLIB2.14一些符号编译成静态库了。

如果需要手动编译osl.编译GLIBC2.14.

编译glibc2.14 放到/opt/glibc-2.14

cd build../configure --prefix=/opt/glibc-2.14make -j 56make install#如果编译错误:cp /etc/ld.so.conf /opt/glibc-2.14/etc/

再创建个bash文件调用GLIBC2.14,然后执行oslc,起名为:run_oslc

#!/usr/bin/env bashGLIB_LIB_PATH=/opt/glibc-2.14/libKTOA_ROOT=/opt/solidangle/KtoA-2.2.0.2-kat3.0-linux/export LD_LIBRARY_PATH=${GLIB_LIB_PATH}:${LD_LIBRARY_PATH}exec "${KTOA_ROOT}/bin/oslc" "$@"

则编译shader是:./run_oslc gamma.osl

Katana要加载osl shader 必须:export ARNOLD_PLUGIN_PATH=/mnt/Proj_Lighting/RD/katana3_plugin/Arnold/OSL_Shaders 要指定这个环境变量,

把shader放到这个里面，Katana会自动编译这些oslshader，不用自己去手动编译

2,添加辅助信息：

shader gamma[[ string help = "Simple mat" ]](color cin = color(0,0,0)[[string help="InputColor",float min = 0, float max = 1]],output color Cout=color(0,0,0)){    Cout = cin;}

3,Diffuse with noise

#include 
     
      shader SimpleShader(    color diffuse_color = color(0.6, 0.8, 0.6),    float noise_factor = 0.5,    output closure color bsdf = diffuse(N)){   color material_color = diffuse_color * mix(1.0, noise(P * 10.0), noise_factor);   bsdf = material_color * diffuse(N);}

bsdf默认是个diffuse材质，下面只是乘以一些颜色

4,Metal Reflection

#include 
     
      shader GOSL_Metal(    color diffuse_color = color(0.6, 0.8, 0.6),    output closure color bsdf =0){      bsdf = diffuse_color * reflection(N);}

diffuse(N):

5,Depth Color Channel:

#include 
     
      shader GOSL_Metal(    float divide_value = 10,    output color bsdf =0[[float min=0,float max=1000000000]]){     point camera;   camera = transform("camera","world",point(0,0,0));   bsdf = sqrt(dot(camera-P,camera-P))/divide_value;   }

6,Noise shader:

#include 
     
      /*Coding Time:2018/9/10liuyangping207@qq.com*/vector getNoise(vector inputPos,float amp,vector offset,vector freq,int turbulence, float rough){    vector fp = 0;    vector sum=0;    vector sample_p = (inputPos + offset) * freq;    float contrib = 1;    for(int i=0;i

7,metadata in katana

#include 
      
       /*Coding Time:2018/9/10liuyangping207@qq.com*/#define OPTION_A 0#define OPTION_B 1#define OPTION_C 2 shader TestCode(    int booleanvalue = 0 [[ string widget = "boolean" ]],    int enumvalue = 0 [[ string widget = "popup", string options = "OptionA|OptionB|OptionC" ]],    output color cout=0    ){    if (booleanvalue)        cout=color(1,0,0);    if (enumvalue == OPTION_B)        cout=color(0,1,0);}

View Code

8,Bounding obj color:

#include 
      
       /*Coding Time:2018/9/10liuyangping207@qq.com*/int zero_compare(float a ) {    return a >= -0.00001 && a <=  0.00001;} float fit(float var, float omin, float omax, float nmin, float nmax) {    float d = omax - omin;    if (zero_compare(d)) {        return (nmin + nmax) * 0.5;    }    if (omin < omax) {        if (var < omin) return nmin;        if (var > omax) return nmax;    } else {        if (var < omax) return nmax;        if (var > omin) return nmin;    }    return nmin + (nmax - nmin) * (var - omin) / d;} shader TestCode(    output color cout=0    ){    point Po = transform("object", P);        point rbound[2];    getattribute("geom:objbounds", rbound);            point pmin = rbound[0];    point pmax = rbound[1];        float bx = fit(Po[0],pmin[0],pmax[0],0,1);    float by = fit(Po[1],pmin[1],pmax[1],0,1);    float bz = fit(Po[2],pmin[2],pmax[2],0,1);     cout = color(bx,by,bz);}

View Code