osh-js/core/ui/view/map/shaders/ImageDrapingFS.js

OSH javascript Toolkit

export default "\nin vec3 v_positionEC;\nin vec3 v_normalEC;\nin vec2 v_st;\n\nvec4 windowToEye(vec4 fragCoord)\n{\n    vec2 uv = fragCoord.xy / czm_viewport.zw;\n    float z_window = czm_unpackDepth(texture(czm_globeDepthTexture, uv));\n\n    //\n    if (z_window == 0.0)\n        discard;\n\n    vec4 eyeCoordinate = czm_windowToEyeCoordinates(fragCoord.xy, z_window);\n    //\n    return eyeCoordinate / eyeCoordinate.w;\n}\n\n// Camera model and frames are based on OpenCV conventions:\n// http://docs.opencv.org/2.4/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html\n// we pass in a normalized intrinsic matrix as uniform so we can compute the normalized texture coordinates directly\n\nvoid main()\n{\n    vec3 positionToEyeEC = -v_positionEC;\n    \n    // get fragment 3D pos in eye coordinates using depth buffer value at fragment location\n    vec4 v_posEC = windowToEye(gl_FragCoord);\n\n    // translate to video cam frame\n    vec4 camPosEC = czm_modelViewRelativeToEye * czm_translateRelativeToEye(camPosHigh_1, camPosLow_2);\n    vec4 v_posCam = v_posEC - camPosEC;\n\n    // rotate to video cam frame\n    vec3 lookRay = camAtt_3 * czm_inverseViewRotation3D * v_posCam.xyz;\n\n    // discard if behind camera\n    if (lookRay.z < 0.1)\n        discard;\n\n    // undistort\n    float xn = lookRay.x / lookRay.z;\n    float yn = lookRay.y / lookRay.z;\n    float k1 = camDistR_5[0];\n    float k2 = camDistR_5[1];\n    float k3 = camDistR_5[2];\n    float p1 = camDistT_6[0];\n    float p2 = camDistT_6[1];\n\n    float r2 = xn * xn+ yn * yn;\n    float r4 = r2 * r2;\n    float r6 = r4 * r2;\n    float xd = xn * (1. + k1 * r2 + k2 * r4 + k3 * r6) + 2. * p1 * xn * yn + p2 * (r2 + 2. * xn * xn);\n    float yd = yn * (1. + k1 * r2 + k2 * r4 + k3 * r6) + 2. * p2 * xn * yn + p1 * (r2 + 2. * yn * yn);\n\n    // project with pinhole model\n    vec3 st = camProj_4 * vec3(xd, yd, 1.);\n    st.y = 1.0 - st.y;\n\n    if (st.x < 0.0 || st.x > 1.0 || st.y < 0.0 || st.y > 1.0)\n        discard;\n\n    // get color from material\n    czm_materialInput materialInput;\n    materialInput.positionToEyeEC = positionToEyeEC;\n    materialInput.st = vec2(st.x, st.y);\n    czm_material material = czm_getMaterial(materialInput);\n    out_FragColor = vec4(material.diffuse + material.emission, material.alpha);\n\n    //float depth = pow(v_posEC.z * 0.5 + 0.5, 8.0);\n    //gl_FragColor = vec4(depth, depth, depth, 1.0);\n}";
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