fixed RayTest calls to use the fps ray distances

Also fixed a minor bug with how grenade radius was being added to classic instead of fps ray distance.  Not sure this will make any noticeable difference but it should be a faster calculation since it searches a smaller volume on each frame.

src/game/CGrenade.cpp

@@ -145,13 +145,15 @@ void CGrenade::FrameAction() {
         // | /
         // |G  <- approaching wall at 45° needs sqrt(2)*radius to intersect wall... lower angles might pass collision instead
         static Fixed addRad = sqrt(2)*partList[0]->enclosureRadius;
-        Fixed classicRayLength = NormalizeVector(3, rayHit.direction) + addRad;
-        rayHit.distance = classicRayLength;
+        // use the smaller FPS-scaled rayLength to search a much smaller volume
+        Fixed rayLength = FpsCoefficient2(NormalizeVector(3, rayHit.direction)) + addRad;
+        rayHit.distance = rayLength;
         RayTestWithGround(&rayHit, kSolidBit);
 
         // if the grenade path (ray test) intersects with an object during this frame
-        Fixed classicRayDistance = ClassicCoefficient2(rayHit.distance);
-        if (classicRayLength > classicRayDistance) {
+        if (rayLength > rayHit.distance) {
+            // scale distance up to Classic so it's backed out properly when adding to location
+            Fixed classicRayDistance = ClassicCoefficient2(rayHit.distance);
             speed[0] = FMul(rayHit.direction[0], classicRayDistance);
             speed[1] = FMul(rayHit.direction[1], classicRayDistance);
             speed[2] = FMul(rayHit.direction[2], classicRayDistance);

src/game/CSmart.cpp

@@ -320,8 +320,8 @@ if (IsClassicInterval()) { // indented like this because hope to remove it in th
         rayHit.closestHit = NULL;
 
         rayHit.distance = NormalizeVector(3, rayHit.direction);
-
         realSpeed = rayHit.distance;
+        rayHit.distance = FpsCoefficient2(rayHit.distance);
 
         RayTestWithGround(&rayHit, kSolidBit);
 
@@ -336,7 +336,7 @@ if (IsClassicInterval()) { // indented like this because hope to remove it in th
             }
 
             if (rayHit.closestHit) {
-                realSpeed = rayHit.distance;
+                realSpeed = ClassicCoefficient2(rayHit.distance);
                 speed[0] = FMul(rayHit.direction[0], realSpeed);
                 speed[1] = FMul(rayHit.direction[1], realSpeed);
                 speed[2] = FMul(rayHit.direction[2], realSpeed);