fixed some implicit cast warnings

modules/preprocessing/processors/glgradientvolumegenerator.cpp

@@ -95,7 +95,7 @@ namespace campvis {
             glViewport(0, 0, static_cast<GLsizei>(size.x), static_cast<GLsizei>(size.y));
 
             // render quad to compute difference measure by shader
-            for (tgt::svec3::ElemType z = 0; z < size.z; ++z) {
+            for (int z = 0; z < static_cast<int>(size.z); ++z) {
                 float zTexCoord = static_cast<float>(z)/static_cast<float>(size.z) + .5f/static_cast<float>(size.z);
                 _shader->setUniform("_zTexCoord", zTexCoord);
                 _fbo->attachTexture(resultTexture, GL_COLOR_ATTACHMENT0, 0, z);

modules/randomwalk/ext/RandomWalksLib/RandomWalksCore.cpp

@@ -69,8 +69,8 @@ void RandomWalksCore::setLabeling(const std::vector<int>  * seeds, const std::ve
 
 void RandomWalksCore::assemble_Lu_b()
 {
-	const int n = seeds->size();// # marked nodes
-	const int q = numel-seeds->size(); // # unmarked nodes
+	const int n = static_cast<int>(seeds->size());// # marked nodes
+	const int q = static_cast<int>(numel-seeds->size()); // # unmarked nodes
 
 	// Permutation matrix to get UNMARKED COLUMNS
 	SparseMatrix<double> Cu(numel,q);
@@ -112,8 +112,8 @@ void RandomWalksCore::assemble_Lu_b()
 
 void RandomWalksCore::generateUniqueIndices()
 {
-	const int n = seeds->size();// # marked nodes
-	const int q = numel-seeds->size(); // # unmarked nodes
+	const int n = static_cast<int>(seeds->size());// # marked nodes
+	const int q = static_cast<int>(numel-seeds->size()); // # unmarked nodes
 
 	std::vector<int> uidx_temp(numel);