FGFS-4.1/simgear
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Vassilii Khachaturov:

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Fix the current buggy rain orientation behaviour for the views attached to the
aircraft (while still inheriting bugs with the views attached to anything else).
This commit is contained in:
ehofman
2006-02-02 09:56:48 +00:00
parent b3770cd26c
commit 21c89e8163
1 changed files with 12 additions and 6 deletions
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simgear/environment/visual_enviro.cxx
+12 -6
View File
@@ -424,17 +424,23 @@ void SGEnviro::drawRain(double pitch, double roll, double heading, double speed,
int slice_count = static_cast<int>(
(40.0 + rain_norm*150.0)* precipitation_density / 100.0);
float angle = speed;
if( angle > 90.0 )
angle = 90.0;
// www.wonderquest.com/falling-raindrops.htm says that
// Raindrop terminal velocity is 5 to 20mph
// Rather than model it accurately (temp, pressure, diameter), and make it
// smaller than terminal when closer to the precipitation cloud base,
// we interpolate in the 5-20mph range according to rain_norm.
double raindrop_speed_kts
= (5.0 + rain_norm*15.0) * SG_MPH_TO_MPS * SG_MPS_TO_KT;
float angle = atanf(speed / raindrop_speed_kts) * SG_RADIANS_TO_DEGREES;
// We assume that the speed is HORIZONTAL airspeed here!!! XXX
// DOCUMENT THE CHANGE IN THE PARAMETER speed MEANING BY RENAMING IT!!!
glPushMatrix();
// TODO:find the real view orientation, not the AC one
// the cone rotate with speed
angle = -pitch - angle;
glRotatef(heading, 0.0, 1.0, 0.0);
glRotatef(roll, 0.0, 0.0, 1.0);
glRotatef(angle, 1.0, 0.0, 0.0);
glRotatef(roll, 0.0, 1.0, 0.0);
glRotatef(heading, 0.0, 0.0, 1.0);
// up cone
DrawCone2(15.0, 30.0, slice_count, true, rain_norm, speed);