issue with lights, seems backwards?

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bitJericho

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Posted: 15th Feb 2010 23:30

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Check out the attached screenshot. My car is pointing towards the light (where the box is). Why is the light coming from the back end?

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thenerd

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Posted: 15th Feb 2010 23:35

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code please?
your problem might be because of the ambient light.

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bitJericho

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Posted: 16th Feb 2010 00:04 Edited at: 16th Feb 2010 00:04

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I turned off ambient light completely and the light highlights were still on the wrong side, here's some relevant code and attached is the entire project (requires BBB GUI from WIP and matrix1utils, and newton):

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SYNC ON
SYNC RATE 60
Color Backdrop 0 : Clear Camera View 0
`BackDrop Off

POSITION LIGHT 0, 1000,100,0
SET POINT LIGHT 0, 0,0,0
`POINT LIGHT 0, 0,0,0
SET AMBIENT LIGHT 80

TYPE environment
    sun_object_number AS INTEGER
    sun_image_number AS INTEGER
    sky_object_number AS INTEGER
    sky_image_number AS INTEGER
ENDTYPE

environment AS environment

environment.sun_object_number = FIND FREE OBJECT()
MAKE OBJECT PLAIN environment.sun_object_number,100,100
POSITION OBJECT environment.sun_object_number,1000,100,0
environment.sun_image_number = FIND FREE IMAGE()
LOAD IMAGE "data/sun.tga",environment.sun_image_number
TEXTURE OBJECT environment.sun_object_number,environment.sun_image_number
SET OBJECT TRANSPARENCY environment.sun_object_number,4
SET OBJECT LIGHT environment.sun_object_number, 0

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bitJericho

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Posted: 16th Feb 2010 01:04

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lol, I used "SET POINT LIGHT" instead of "POINT LIGHT"

This is how things usually go for me. Thanks anyway

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Green Gandalf

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Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.

Posted: 16th Feb 2010 01:14 Edited at: 16th Feb 2010 01:15

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Quote: "I used "SET POINT LIGHT" instead of "POINT LIGHT""

Oops.

Just looked at the point light Help file:

Quote: "Description

Only spot lights and directional lights can make use of this command. The light number must be specified using an integer value. The coordinates must be specified using real values.
"

How would a directional light use this? A directional light "points at" every point in the world from a particular direction. Perhaps DBPro uses "position" as a direction in this case?

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bitJericho

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Posted: 16th Feb 2010 03:46

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Good point, would have saved me time if I had thought about it

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Hawkblood

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Posted: 16th Feb 2010 20:58

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Uhhhh.... Light 0 the default "directional light". I think you may have already figured out the answer, but just in case you haven't: point light 0 in the direction you want and then set the color and the level.... It makes no sense to position the light.

The fastest code is the code never written.

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Green Gandalf

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Posted: 17th Feb 2010 01:11

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You may well be right - but it's not what the Help file says:

Quote: "POINT LIGHT
This command will point an existing light at a location within the scene.

Syntax

POINT LIGHT Light Number, X, Y, Z

Parameters

Light Number

Integer
The light number
X

Float
The x location to point light at
Y

Float
The y location to point light at
Z

Float
The z location to point light at
"

It's quite clearly talking about LOCATIONS not DIRECTIONS.

The Help files are well-known to be infallible ...

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Hawkblood

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Posted: 17th Feb 2010 02:01

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Quote: "SET DIRECTIONAL LIGHT
This command will set an existing light to that of a directional light.

Syntax

SET DIRECTIONAL LIGHT Light Number, NX, NY, NZ

Parameters

Light Number

Integer
The light number
NX

Float
The x direction is specified using directional values assuming that the origin of the light is 0,0,0
NY

Float
The y direction is specified using directional values assuming that the origin of the light is 0,0,0
NZ

Float
The z direction is specified using directional values assuming that the origin of the light is 0,0,0 "

I think this is what he needs. The light number is 0 for the default directional light..... You can never use light 0 for anything but directional lighting.

The fastest code is the code never written.

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Green Gandalf

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Posted: 17th Feb 2010 12:54

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Quote: "The light number is 0 for the default directional light..... You can never use light 0 for anything but directional lighting."

Not true.

Try this:

+ Code Snippet

sync on : sync rate 60 : sync

autocam off
position camera 0, 0, -500
point camera 0, 0, 0

make object plain 1, 500, 500, 40, 40 ` IanM's plains are better for DBPro point lights
xrotate object 1, 270

` use the following line instead if you don't have IanM's Matrix1 plugin
`make object plain 1, 500, 500

set point light 0, 200, 200, -100

sync
sync
wait key
end

Light 0 is always present by default and is also a directional light by default - but it can be changed (and hidden so it isn't really "present"

).

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Hawkblood

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Posted: 17th Feb 2010 14:32

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Quote: "Light 0 is always present by default and is also a directional light by default - but it can be changed (and hidden so it isn't really "present" ). "

Well, that's good to know. I thought I read that it's ONLY directional.... Maybe I misread. But, yes, it can be turned off and the attributes can be changed.

The fastest code is the code never written.

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DarkBASIC Professional Discussion / issue with lights, seems backwards?

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