OpenGL Tutorial 12 - Drawing A Circle Using A Triangle Fan

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Thanks for the video. Bu I had error with these lines:
GLfloat
GLfloat
GLfloat

GLfloat * 3];

the error is (Error C3863 array type 'GLfloat [numberOfVertices*]' is not assignable) .

thelegend

Thanks for this video. Love the drawing board explanation.

AnObj

How do you change the colour of the circle?

VibhaMasti

I can't really understand these lines:

for(int i=1; i<numberofvertices; i++)
{
arrayX[i]= x + (radius * cos(i* (doublepi/numberofsides) ));

arrayY[i]= y + (radius * sin (i* (doublepi/numberofsides) ));

arrayZ[i]= z;
}

what would had happen if I would want to draw a sphere, what would had happen to arrayZ[i] in this case?
Also, why is it necessary to multiply radius with cos(i* (doublepi/numberofsides) ), it's hard for me to find it's logic... Thank you in advance!

drcvagos-iu

well i have problem with your source code on my Visual Studio 2015
on this part
"expression must have a constant value"

GLfloat
GLfloat
GLfloat

YaHoMaKo

Sonar Systems your channel is very good and i like your videos too :) i subscribed

COLORPAPERPRINCESS

GLfloat

numberOfVertices is giving me an error of expression must have a constant value.

johnquebec

How to convert allCircleVertices to NDC values i, e -1 to 1 range as iam not using glviewport

kareemunnisabegum

Thanks a lot for the video and your work.
I want to draw a rectangle where its distance from centre differs every time..so here r*cos and r*sin doesnt work..how to create?

rajurambha

how can I color the circle or the shape? (Im using lwjgl 2.9.4 java)

fls

Hey! Great video! Are you using OpenGL 3 or 2?

caiquecoelho

How can we change the colors of circles?

fatihbaba

ok so when using visual studio the compiler wont let you set the number of elements in an array to a number that isnt a constant. this is pretty common knowledge because its unsafe, i dont know which compiler you're using that lets you get away with that but it isn't great.

leetlemahn

Finally got it to work, but I have no idea how the math parts of drawCircle() work.

receperdogan

OpenGL Tutorial 12 - Drawing A Circle Using A Triangle Fan

OpenGL Tutorial 12 - Drawing A Circle Using A Triangle Fan

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