Richtige Indizierung beim Hinzufügen der neuen Indizes zum Buffer,

Schatten sehen richtig aus, aber Cormacks Reverse gilt immer noch nicht.
D.h. wenn man sich in die Schatten hineinbegibt, springt plötzlich die
Anzeige von Schatten auf Nicht-Schatten

Author: CompN3rd

10/code/shader/material_and_light.frag

@@ -29,7 +29,7 @@ uniform int drawShadows;
 void main() {
   // TODO: add an option to switch between normal lighting and shadow color (black) rendering //
   if(drawShadows == 1) {
-      color = vec4(1,0,0,0.3);
+      color = vec4(0,0,0,0.5);
       return;
   }
 

10/code/src/Ex10.cpp

@@ -486,7 +486,7 @@ void renderShadow() {
     }
 
     //Done TODO: disable drawing to screen (we just want to change the stencil buffer) //
-    /*glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
+    glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
     glDepthMask(GL_FALSE);
     //Done TODO: enable stencil test and face culling //
     // - we need face culling to separately render front facing and back facing triangles //
@@ -501,20 +501,12 @@ void renderShadow() {
     glm_ModelViewMatrix.top() *= glm::scale(glm::vec3(10));
     glUniformMatrix4fv(uniformLocations["modelview"], 1, false, glm::value_ptr(glm_ModelViewMatrix.top()));
     glUniform1i(uniformLocations["drawShadows"], 1);
-
-    // setup light and material in shader //
-    setupLightAndMaterial();*/
+    
 
     MeshObj *mesh = objLoader.getMeshObj("sceneObject");
-    glDisable(GL_CULL_FACE);
-    glUniform1i(uniformLocations["drawShadows"], 1);
-    glEnable( GL_BLEND );
-    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
     mesh->renderShadowVolume();
-    glDisable(GL_BLEND);
-    glEnable(GL_CULL_FACE);
 
-    /*glStencilOp(GL_KEEP,GL_KEEP,GL_DECR);
+    glStencilOp(GL_KEEP,GL_KEEP,GL_DECR);
     glCullFace(GL_FRONT);
 
     mesh->renderShadowVolume();
@@ -532,10 +524,8 @@ void renderShadow() {
     glEnable( GL_BLEND );
     glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 
-
-
     renderScreenFillingQuad();
-    glDisable( GL_BLEND );*/
+    glDisable( GL_BLEND );
 
 
     //Done TODO: disable stencil testing for further rendering and restore original rendering state //

10/code/src/MeshObj.cpp

@@ -178,11 +178,10 @@ void MeshObj::initShadowVolume(glm::vec3 lightPos) {
     // TODO: for every vertex:                         //
     // - project vertex from lightsource to *infinity* //
     // - append vertex to local vertex data storage    //
-    GLfloat farFarAway = 1000.0f;
+    GLfloat farFarAway = 100.0f;
 
     unsigned int numVerts = shadows.vertex_position.size();
-
-    for (int i=0 ; i < numVerts; i = i+3){
+    for (unsigned int i=0 ; i < numVerts; i = i+3){
         glm::vec3 vpos(shadows.vertex_position[i],shadows.vertex_position[i+1],shadows.vertex_position[i+2]);
 
         glm::vec3 lDir = vpos - lightPos;
@@ -201,7 +200,8 @@ void MeshObj::initShadowVolume(glm::vec3 lightPos) {
     // - the second set contains the projected vertex data *in the same order*         //
     // -> you might want to store the size of such a set to easily access              //
     //    corresponding vertices later on                                              //
-    GLuint sizeOfSet = shadows.vertex_position.size()/2;
+    GLuint sizeOfSet = shadows.vertex_position.size()/(2*3); //because in vertex_position each position vector has 3 elements
+
     // TODO: project 8 (6 sides + 2 caps) shadow triangles for each mesh triangle //
     // - process every geometry face and create 6 (or 8) new faces from it        //
     // - be sure to check the face orientation and flip back facing triangles     //  
@@ -255,8 +255,8 @@ void MeshObj::initShadowVolume(glm::vec3 lightPos) {
         shadows.indices.push_back(ia1);
 
         shadows.indices.push_back(ib1);
-        shadows.indices.push_back(ic1);
         shadows.indices.push_back(ia1);
+        shadows.indices.push_back(ic1);
 
     }
     // TODO: save the index count of your shadow volume object in 'mIndexCount_shadow' //