Custom shaders for image draping

ImageDrapingFS.js

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+//This file is automatically rebuilt by the Cesium build process.
+/*global define*/
+define(function() {
+    'use strict';
+    return "varying vec3 v_positionEC;\n\
+varying vec3 v_normalEC;\n\
+varying vec2 v_st;\n\
+\n\
+\n\
+vec4 windowToEye(vec4 fragCoord)\n\
+{\n\
+  vec2 uv = fragCoord.xy / czm_viewport.zw;\n\
+  float z_window = czm_unpackDepth(texture2D(czm_globeDepthTexture, uv));\n\
+  if (z_window == 1.0)\n\
+    discard;\n\
+  \n\
+  float near = czm_depthRange.near;\n\
+  float far = czm_depthRange.far;\n\
+  \n\
+  vec3 ndcPos;\n\
+  ndcPos.x = 2.0 * (fragCoord.x - czm_viewport.x) / czm_viewport.z - 1.0;\n\
+  ndcPos.y = 2.0 * (fragCoord.y - czm_viewport.y) / czm_viewport.w - 1.0;\n\
+  ndcPos.z = (2.0 * z_window - near - far) / (far - near);\n\
+    \n\
+  vec4 clipPos;\n\
+  clipPos.w = czm_projection[3][2] / (ndcPos.z - (czm_projection[2][2] / czm_projection[2][3]));\n\
+  clipPos.xyz = ndcPos * clipPos.w;\n\
+  \n\
+  return czm_inverseProjection * clipPos;\n\
+  //return vec4(ndcPos, 1.0);\n\
+}\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\
+void 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\
+    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\
+    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\
+    gl_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\
+}\n\
+";
+});

ImageDrapingVS.js

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+//This file is automatically rebuilt by the Cesium build process.
+/*global define*/
+define(function() {
+    'use strict';
+    return "attribute vec3 position3DHigh;\n\
+attribute vec3 position3DLow;\n\
+attribute vec3 normal;\n\
+attribute vec2 st;\n\
+\n\
+varying vec3 v_positionEC;\n\
+varying vec3 v_normalEC;\n\
+varying vec2 v_st;\n\
+\n\
+void main() \n\
+{\n\
+    vec4 p = czm_computePosition();\n\
+\n\
+    v_positionEC = (czm_modelViewRelativeToEye * p).xyz;      // position in eye coordinates\n\
+    v_normalEC = czm_normal * normal;                         // normal in eye coordinates\n\
+    v_st = st;\n\
+    \n\
+    gl_Position = czm_modelViewProjectionRelativeToEye * p;\n\
+}\n\
+";
+});